JP2012183980A - In-wheel type wheel drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-wheel type wheel drive device enabling a further reduction in size and weight.SOLUTION: An inner wheel hub 21 joined to a wheel hub 19c is connected to a motor 11 through a speed reducer 12. The inner wheel hub 21 and the output shaft 11a of the motor 11 are disposed on the same axis. The speed reducer 12 includes an input sun gear 26 coaxially joined to the output shaft 11a, an output sun gear 27 coaxially joined to the inner wheel hub 21, and a plurality of twin pinion planetary gears 28 which comprise input side pinions 28a meshed with the input sun gear 26 and output side pinions 28b meshed with the output sun gear 27. The plurality of twin pinion planetary gears 28 are installed while the revolution thereof is restricted.

Description

  The present invention relates to an in-wheel type wheel drive device that is disposed on the inner side in the vehicle width direction of a wheel and drives the wheel with the power of a motor.

An in-wheel type wheel drive device in which a motor unit is individually installed on the inner side in the vehicle width direction of the wheel is known.
This in-wheel type wheel drive device has many merits such as an increase in cabin space due to the abolishment of the engine room and improvement in vehicle motion performance due to the low center of gravity arrangement of the drive unit when used in a four-wheel vehicle, for example. In addition, if applied to the driven wheels (rear wheels) of a front-wheel drive vehicle, a four-wheel drive vehicle can be easily developed on the platform of the FF vehicle, which has a great merit in terms of vehicle development investment.

  By the way, when this in-wheel type wheel drive device is adopted in a vehicle, the space inside is occupied by the motor unit (motor and speed reduction mechanism) on the inner side in the vehicle width direction. Each part of the car body must be designed to avoid it. For this reason, in this kind of wheel drive device, it is desired that it is compact, and various devices for making the device compact have been made (for example, see Patent Document 1).

In an in-wheel type wheel drive device described in Patent Document 1, an inner ring hub that is coupled to a wheel hub of a wheel on the inner side in the vehicle width direction and a motor that generates a driving force are arranged coaxially, and an inner side of an inner rotor of the motor. A concave portion is provided on the surface facing the inner ring hub side, and the speed reducer is arranged so that a part thereof enters the concave portion. A housing that supports the motor and the reduction gear, and an outer ring hub that supports the inner ring hub via a bearing are attached to a suspension component on the vehicle body side. The speed reducer includes a plurality of input sun gears coupled to the output shaft of the motor, a ring gear fixed in the housing, one pinion meshed with the input sun gear, and the remaining one pinion meshed with the ring gear. A double pinion planetary gear and a carrier rotatably supporting the plurality of double pinion planetary gears and coupled to the inner ring hub so as to rotate together with the inner ring hub. It is transmitted to the inner ring hub via a continuous pinion planetary gear and a carrier.
In this in-wheel type wheel drive device, the concave portion is provided inside the inner rotor of the motor, and the speed reducer is installed so that a part of the inner portion enters the concave portion, so that the axial dimension can be shortened. Can do.

JP 2007-99106 A

However, since this conventional in-wheel type wheel drive device has to install the large ring gear of the speed reducer together with its support member in the housing, the overall size of the device increases, and the device is proportional to the square of the outer diameter. Will greatly increase the weight.
In the case of an in-wheel type wheel drive device, an increase in the weight of the device is directly linked to an increase in the unsprung weight of the vehicle. Therefore, it is desired to reduce the weight as much as possible in order to improve the motion performance and riding comfort of the vehicle.

  Therefore, the present invention intends to provide an in-wheel type wheel drive device that can be further reduced in size and weight.

The in-wheel type wheel drive device according to the present invention employs the following means in order to solve the above problems.
The invention according to claim 1 is coupled to a wheel hub of a wheel (for example, the wheel hub 19c of the embodiment) on the inner side in the vehicle width direction and is rotatable on the vehicle body side via a bearing (for example, the bearing 23 of the embodiment). An inner ring hub (for example, the inner ring hub 21 of the embodiment) supported by the motor, a motor (for example, the motor 11 of the embodiment) that is disposed inside the inner ring hub and generates driving force, and the motor An in-wheel type wheel drive device comprising a reducer (for example, the reducer 12 of the embodiment) that is interposed between the inner ring hubs and transmits the reduced rotation of the motor to the inner ring hub. The output shaft of the motor (for example, the output shaft 11a of the embodiment) and the inner ring hub are arranged coaxially, and the speed reducer is connected to the output shaft of the motor coaxially with an input sun gear (for example, Implementation Input sun gear 26), an output sun gear (for example, the output sun gear 27 of the embodiment) that is coaxially coupled to the inner ring hub, and one pinion (for example, the input side pinion 28a of the embodiment) A plurality of double pinion planetary gears (for example, the dual pinion planetary gear 28 of the embodiment) in which the remaining one pinion (for example, the output side pinion 28b of the embodiment) meshes with the output sun gear. The plurality of double pinion planetary gears are installed in a state in which revolution is restricted.
Thus, when the motor is driven, the rotation of the output shaft of the motor is transmitted from the input sun gear to one pinion (28a) of each double pinion planetary gear. At this time, since the revolution of each double pinion planetary gear is restricted, the rotation transmitted to each double pinion planetary gear is transmitted to the inner ring hub via the remaining one pinion (28b). Thereby, the wheel rotates integrally with the inner ring hub.

According to a second aspect of the present invention, in the in-wheel type wheel drive device according to the first aspect, a brake drum of a drum type brake device (for example, the brake drum 20 of the embodiment) is coupled to the inner ring hub, The double pinion planetary gear includes an input side pinion (for example, the input side pinion 28a of the embodiment) and an output side pinion (for example, the output side pinion 28b of the embodiment), and at least a part of the output side pinion is the aforementioned It is arrange | positioned inside the internal peripheral surface of a brake drum, It is characterized by the above-mentioned.
Accordingly, a part of the double pinion planetary gear is disposed so as to overlap the brake drum in the axial direction inside the brake drum of the drum brake device.

According to a third aspect of the present invention, in the in-wheel type wheel drive device according to the first aspect, a brake disc (for example, the brake disc 40 of the embodiment) of the disc type brake device is coupled to the inner ring hub. A caliper (for example, the caliper 41 of the embodiment) that brakes the brake disk is disposed between adjacent ones of the plurality of double pinion planetary gears in the circumferential direction. .
As a result, the caliper of the disc type brake device is disposed so as to overlap the double pinion planetary gear in the axial direction.

According to a fourth aspect of the present invention, there is provided an in-wheel type wheel drive device according to any one of the first to third aspects, wherein the inner ring hub is supported by a vehicle body side fixed outer ring hub (for example, an embodiment). The outer ring hub 22) is provided, and the plurality of double pinion planetary gears are rotatably supported by the outer ring hub in a state in which revolution is restricted.
As a result, the rigid outer ring hub that supports the inner ring hub on its outer peripheral side also serves as a support portion for the plurality of double pinion planetary gears.

The invention according to claim 5 is the in-wheel type wheel drive device according to any one of claims 1 to 4, wherein the housing covers the speed reducer and the motor (for example, the speed reducer case 30 and the motor case of the embodiment). 29) The lubricating oil (for example, the lubricating oil Oi of the embodiment) is stored below the inner side of 29), and at least one of the plurality of double pinion planetary gears is disposed so as to be immersed in the lubricating oil. It is characterized by.
As a result, when a plurality of double pinion planetary gears are rotated by driving the motor, the double pinion planetary gears immersed in the lubricating oil in the housing scoop up the lubricating oil upward, and the lubricating oil is applied to the mechanical contact portion in the speed reducer. Will come to supply.

  According to the first aspect of the present invention, the reduction gear includes an input sun gear that is coaxially coupled to the output shaft of the motor, an output sun gear that is coaxially coupled to the inner ring hub, and one pinion that is the input sun gear. And a plurality of double pinion planetary gears that are meshed with the output sun gear, and the plurality of double pinion planetary gears are installed in a state in which revolving is restricted. As a result, the apparatus can be reduced in size and weight by not installing a large ring gear on the outer peripheral side of the double pinion planetary gear.

  According to the second aspect of the present invention, a part of the double pinion planetary gear is disposed inside the brake drum of the drum brake device so as to overlap the brake drum in the axial direction. The shaft length can be shortened.

  According to the third aspect of the present invention, the caliper of the disc type brake device is arranged so as to overlap the double pinion planetary gear in the axial direction, so that the axial length of the entire device can be shortened.

  According to the invention which concerns on Claim 4, since a highly rigid outer ring hub serves also as the support part of several 2nd pinion planetary gears, the further size reduction and weight reduction of the whole apparatus can be achieved.

  According to the invention of claim 5, since the double pinion planetary gear immersed in the lubricating oil in the housing can scoop up the lubricating oil and supply the lubricating oil to the mechanical contact portion in the speed reducer, By eliminating the dedicated oil pump for lubrication, the entire system can be further reduced in size and weight.

1 is a schematic configuration diagram of a vehicle to which a wheel drive device according to an embodiment of the present invention is applied. It is the perspective view which looked at the vehicle to which the wheel drive device of the embodiment of this invention is applied from the back side. It is a schematic sectional drawing of the wheel part for demonstrating arrangement | positioning of the wheel drive device of embodiment of this invention. It is typical sectional drawing corresponding to the AA section of Drawing 6 of a wheel drive device and a wheel of one embodiment of this invention. It is a detailed sectional view corresponding to the AA section of Drawing 6 of the wheel drive device of one embodiment of this invention. It is sectional drawing corresponding to the BB cross section of FIG. 5 of the wheel drive device of one Embodiment of this invention. It is typical sectional drawing corresponding to CC cross section of FIG. 9 of the wheel drive device and wheel of other embodiment of this invention. It is detailed sectional drawing corresponding to CC cross section of FIG. 9 of the wheel drive device of other embodiment of this invention. It is sectional drawing corresponding to the DD cross section of FIG. 8 of the wheel drive device of other embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a schematic configuration of a four-wheel drive electric vehicle 1 using a motor as a power source. The left and right front wheels Wf of the electric vehicle 1 are driven by a main motor unit 2 arranged in front of the cabin. It is designed to be driven. The motor 3 of the main motor unit 2 is connected to a high voltage battery 5 arranged at the rear of the vehicle via a PDU 4 (power drive unit). An in-wheel type wheel drive device 10 is installed in each of the left and right rear wheels Wr (wheels) on the rear wheel support portion on the inner side in the vehicle width direction. As will be described later in detail, each wheel drive device 10 includes a motor 11 and a speed reducer 12 which are drive sources as main components. The motor 11 of each wheel drive device 10 is connected to the high voltage battery 5 via a PDU 13 (power drive unit).
In addition, since each wheel drive device 10 of the left and right rear wheels Wr has the same configuration, only one wheel drive device 10 will be described below. In addition, the motor 3 of the main motor unit 2 and the motor 11 of each wheel driving device 10 not only receive power from the high voltage battery 5 but also perform regenerative power generation when braking the vehicle.

FIG. 2 is a view of the rear part of the vehicle as viewed from the back side.
As shown in FIGS. 1 and 2, in this electric vehicle 1, a trailing arm type suspension is used as a suspension on the rear wheel Wr side, and left and right end portions of a torsion beam 14 extending in the vehicle width direction are used. The vehicle front side is attached to the vehicle body via a pivot shaft 15, and a trailing arm 16 extending from the pivot shaft 15 to the vehicle body rear side is connected to the left and right ends of the torsion beam 14. A suspension spring 17 and a shock absorber (not shown) are interposed between each trailing arm 16 and the vehicle body. The wheel drive device 10 and the rear wheel Wr are attached to the left and right trailing arms 16.
In addition, an electrical equipment housing chamber 18 for housing the PDU 13 and other electrical equipment is provided at a lower position of a trunk room (not shown) of the vehicle, as shown in FIG. The left and right trailing arms 16 and the rear wheel Wr are disposed adjacent to the outside of the electrical equipment storage chamber 18 in the vehicle width direction.

FIG. 3 is a schematic cross-sectional view of the trailing arm 16, the rear wheel Wr, and the wheel drive device 10 when they are cut in a substantially horizontal direction in order to show the positional relationship.
The wheel 19 of the rear wheel Wr includes a wheel rim 19a that holds the tire T on the outer peripheral surface, a wheel disc 19b that is provided on the end surface of the wheel rim 19a on the vehicle outer side, and a wheel that is provided on the radially inner side of the wheel disc 19b. The wheel reducer 12 and the motor 11 of the wheel drive device 10 are disposed on the inner side in the vehicle width direction of the wheel hub 19c.

FIG. 4 is a schematic cross-sectional view of the wheel 19 of the rear wheel Wr and the wheel drive device 10, and FIGS. 5 and 6 are detailed cross-sectional views of the wheel 19 and the wheel drive device 10.
In the wheel drive device 10, an inner ring hub 21 is integrally coupled with a bottomed cylindrical brake drum 20 of a drum type brake device on the inner side in the vehicle width direction of the wheel hub 19 c. The inner ring hub 21 is rotatably supported via a bearing 23 inside an outer ring hub 22 fixed to the vehicle body side (fixed to the trailing arm 16). The motor 11 is an inner rotor type motor in which the rotor 25 is arranged inside the annular stator 24. In this embodiment, in order to reduce drag when the rear wheel Wr is not driven, A type of motor having no permanent magnet such as an induction machine or a reductance motor is employed.
The output shaft 11a of the motor 11 is arranged coaxially with the inner ring hub 21, and the output shaft 11a and the inner ring hub 21 are connected to each other via a speed reducer 12 using a planetary gear mechanism.

  The reduction gear 12 includes a small-diameter input sun gear 26 that is coaxially coupled to the output shaft 11 a of the motor 11, a large-diameter output sun gear 27 that is coaxially coupled to the inner ring hub 21, an input sun gear 26, and an output sun. And three double pinion planetary gears 28 arranged across the outer peripheral side of the gear 27. Each double pinion planetary gear 28 has a large-diameter input-side pinion 28a and a small-diameter output-side pinion 28b that are coaxially integrated, and the input-side pinion 28a is meshed with the input sun gear 26, and the output-side pinion 28b. Is meshed with the output sun gear 27. The three double pinion planetary gears 28 are arranged at equal intervals around the axis of the output shaft 11a of the motor 11, as will be described in detail later, and each is rotatably held at a fixed position.

Specifically, as shown in FIG. 5, a substantially cylindrical reduction gear case 30 is attached to a front end portion of a motor case 29 that houses the motor 11, and a drum type is attached to the front end portion of the reduction gear case 30. An annular fixing plate 33 for attaching braking parts such as a brake shoe 31 and an operation cylinder 32 of the brake device is attached.
The three double pinion planetary gears 28 are rotatably held at set positions on a common carrier frame 34, respectively. The front end portion of the carrier frame 34 passes through the opening inside the fixed plate 33 and is coupled to the outer ring hub 22, and the rear end portion of the carrier frame 34 is coupled to the front surface of the motor case 29. Each of the double pinion planetary gears 28 is installed in the speed reducer case 30 in a state where the revolution is restricted by the carrier frame 34 in this way. Further, in each of the double pinion planetary gears 28 installed in the speed reducer case 30 through the carrier frame 34 in this manner, a part of the small-diameter output side pinion 28b enters the inner side of the inner peripheral surface of the brake drum 20. Yes. That is, each double pinion planetary gear 28 has an output side pinion 28 b portion that overlaps the brake drum 20 in the axial direction.
In the case of this embodiment, the motor case 29 and the transmission case 30 are attached to the corresponding trailing arm 16, and the outer ring hub 22 is coupled to the trailing arm 16 via these cases 29 and 30. . 4 and 5, reference numeral 35 denotes a bearing for rotatably supporting the output shaft 11 a (rotor 25) of the motor 11 in the motor case 29.

  In addition, the inside of the housing (the reduction gear case 30 and the motor case 29) that covers the reduction gear 12 and the motor 11 serves as a storage chamber for the lubricating oil Oi. Lubricating oil Oi is stored so as not to be immersed in Oi. The lubricating oil Oi also serves to cool the motor 11 and the speed reducer 12.

  By the way, as shown in FIG. 6, at least one of the three double pinion planetary gears 28 installed in the reduction gear case 30 via the carrier frame 34 is arranged vertically below the input sun gear. A part of the input-side pinion 28a and the output-side pinion 28b of the double-pinion planetary gear 28 arranged at the position is always immersed in the lubricating oil Oi in the storage chamber.

In the above configuration, when the rear wheel Wr is driven by the wheel driving device 10, the motor 11 is driven by power control by the PDU 13, and the rotation is decelerated by the speed reducer 12 and transmitted to the inner wheel hub 21. Thereby, the wheel 19 of the rear wheel Wr rotates integrally with the inner ring hub 21.
At this time, in the speed reducer 12, the rotation of the output shaft 11a of the motor 11 is transmitted from the input sun gear 26 to the input side pinions 28a of the three double pinion planetary gears 28, and the rotation is further transmitted through the output side pinions 28b. Is transmitted to the output sun gear 27.

  This wheel drive device 10 does not employ a planetary gear mechanism having a large-diameter ring gear meshing with a planetary gear in the speed reducer 12, and a plurality of two-pinion planetary planets whose revolutions are restricted by rotation of the input sun gear 26. Since a planetary gear mechanism that transmits to the output sun gear 27 via the gear 28 is employed, the apparatus can be reduced in size and weight because a large-diameter ring gear is not used.

  In addition, the wheel drive device 10 is arranged such that a small-diameter output side pinion 28b of the double pinion planetary gear 28 partially enters the radially inner side of the brake drum 20 integrally coupled to the inner ring hub 21. Therefore, the axial length of the entire device can be shortened by the amount that the double pinion planetary gear 28 partially overlaps inside the brake drum 20 in the axial direction. As a result, the rear wheel Wr and the vehicle body side electrical housing chamber can be reduced. It is possible to arrange with a margin in a narrow space between the two.

  Further, in this wheel drive device 10, the front end portion of the carrier frame 34 that holds the plurality of double pinion planetary gears 28 is coupled to the highly rigid outer ring hub 22 that supports the inner ring hub 21 via the bearing 23. Therefore, the outer ring hub 22 having high rigidity also serves as a support portion on the front end side of the plurality of double-pinion planetary gears 28, and there is no need to add a dedicated reinforcing member, thereby further reducing the size and weight of the device. Can be achieved.

  Further, in the case of this wheel drive device 10, one of the three double pinion planetary gears 28 is installed below the rotor 25, and the double pinion planetary gear 28 is added to the lubricating oil Oi stored in the housing. Since it is set to be partially immersed, when the motor 11 is driven, the lubricating oil Oi is lifted upward by the pinions 28a and 28b of the double pinion planetary gear 28, and the lubricating oil is applied to each machine contact portion in the housing. Can be supplied. Therefore, a dedicated oil pump for supplying the lubricating oil Oi to each machine contact portion in the housing can be eliminated, and the entire apparatus can be further reduced in size and weight.

  In the wheel drive device 10, the torque input from the motor 11 to the input sun gear 26 is distributed to the three double pinion planetary gears 28 on the carrier frame 34 and transmitted to the output sun gear 27. Therefore, less torque is required per gear unit (double pinion planetary gear 28), and as a result, the gear unit can be reduced in size and weight. Therefore, in the case of this wheel drive device 10, it is more advantageous in reducing the overall size and weight of the device.

  In addition, since the three double pinion planetary gears 28 are arranged on the carrier frame 34 so as to be even in the circumferential direction, the wheel drive device 10 is connected to the input sun gear 26 or the like from the double pinion planetary gear 28. The radial load acting on the output sun gear 27 can be canceled out by each of the double pinion planetary gears 28. Therefore, radial vibration is less likely to occur in the input sun gear 26 and the output sun gear 27, and the capacity of the bearings 35 and 23 that support the output shaft 11a of the motor 11 and the inner ring hub 21 can be reduced.

  Furthermore, the wheel drive device 10 has a structure in which rotation is transmitted from the input sun gear 26 to the output sun gear 27 via a double pinion planetary gear 28 in which an input side pinion 28a and an output side pinion 28b are provided coaxially. Therefore, if the torsion of the tooth surface set between the input sun gear 26 and the input side pinion 28a and the torsion of the tooth surface set between the output side pinion 28b and the output sun gear 27 are set in the same direction. The thrust force acting on the double pinion planetary gear 28 can be canceled out. As a result, an unnecessary load is less likely to act on the housing, so that the apparatus can be further reduced in size and weight by making the housing thinner.

Next, another embodiment shown in FIGS. 7 to 9 will be described. Note that the same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted.
7 is a schematic cross-sectional view of the wheel 19 of the rear wheel Wr and the wheel drive device 110, and FIGS. 8 and 9 are detailed cross-sectional views of the wheel 19 and the wheel drive device 110. FIG.
The vehicle drive device 110 is basically the same in configuration as that of the above embodiment, but the brake device installed inside the wheel 19 is a disc type brake device in the above embodiment. It is very different from the thing.

  That is, the inner ring hub 21 and the wheel hub 19c are not mounted with a bottomed cylindrical brake drum, but with a brake disc 40 having a braking surface 40a extending radially outward at the outer peripheral edge. The braking surface 40 a of the brake disk 40 is sandwiched by the friction material 42 of the caliper 41 that is fixedly installed on the speed reducer case 30. The caliper 41 is installed such that a main body 41 a containing a hydraulic mechanism or the like is greatly bulged inside the speed reducer case 30. As shown in FIG. 9, the caliper 41 is arranged between adjacent ones in the circumferential direction among the three double pinion planetary gears 28 arranged at equal intervals in the circumferential direction via the carrier frame 34. ing. For this reason, the main body 41 of the caliper 41 does not interfere with the double pinion planetary gear 28 although it bulges greatly inside the reduction gear case 30.

Although the wheel drive device 110 of this embodiment can obtain substantially the same basic effects as the above-described embodiment, the following effects can be obtained separately from the above-described embodiment.
That is, in this wheel drive device 110, the caliper 41 of the disc type brake device is disposed between the two double pinion planetary gears 28 adjacent in the circumferential direction. The caliper 41 can overlap the speed reducer 12 in the axial direction without interfering with the pinion planetary gear 28. Therefore, in this wheel drive device 110, while adopting a disc type brake device in which the caliper 41 extends along the axial direction from a portion facing the braking surface 40a of the brake disc 40, the axial length of the entire device is increased. Can be sufficiently suppressed.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary.

DESCRIPTION OF SYMBOLS 10,110 ... Wheel drive device 11 ... Motor 11a ... Output shaft 12 ... Reduction gear 19c ... Wheel hub 20 ... Brake drum 21 ... Inner ring hub 22 ... Outer ring hub 23 ... Bearing 26 ... Input sun gear 27 ... Output sun gear 28 ... 2 Continuous pinion planetary gear 28a ... Input side pinion 28b ... Output side pinion 29 ... Motor case (housing)
30 ... Reducer case (housing)
Oi ... Lubricating oil 40 ... Brake disc 41 ... Caliper Wr ... Rear wheel (wheel)

Claims (5)

An inner ring hub that is coupled to the wheel hub of the wheel on the inner side in the vehicle width direction and that is rotatably supported on the vehicle body via a bearing;
A motor that is arranged on the inner side of the inner ring hub in the vehicle width direction and generates a driving force;
An in-wheel type wheel drive device comprising: a speed reducer that is interposed between the motor and the inner ring hub and decelerates the rotation of the motor and transmits the reduced speed to the inner ring hub;
The output shaft of the motor and the inner ring hub are arranged coaxially,
The speed reducer is
An input sun gear coupled coaxially to the output shaft of the motor;
An output sun gear coupled coaxially to the inner ring hub;
A plurality of double pinion planetary gears in which one pinion is meshed with the input sun gear and the remaining one pinion is meshed with the output sun gear;
With
An in-wheel type wheel drive device in which the plurality of double pinion planetary gears are installed in a state in which revolution is restricted. A brake drum of a drum brake device is coupled to the inner ring hub,
2. The double-pinion planetary gear includes an input-side pinion and an output-side pinion, and at least a part of the output-side pinion is disposed inside an inner peripheral surface of the brake drum. The in-wheel type wheel drive device described in 1. A brake disc of a disc type brake device is coupled to the inner ring hub,
2. The in-wheel type wheel according to claim 1, wherein a caliper for braking the brake disc is disposed between adjacent ones of the plurality of two-pinion planetary gears in a circumferential direction. Drive device.   A vehicle body side fixed outer ring hub for supporting the inner ring hub via a bearing is provided, and the plurality of dual pinion planetary gears are rotatably supported in a state in which revolution is restricted by the outer ring hub. The in-wheel type wheel drive device according to any one of claims 1 to 3. Lubricating oil is stored inside and below the housing that covers the reduction gear and the motor,
5. The in-wheel type wheel drive according to claim 1, wherein at least one of the plurality of double pinion planetary gears is disposed so as to be immersed in the lubricating oil. apparatus.

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