JP5449279B2 - Vehicle drive device - Google Patents

Description

  The present invention relates to a vehicle drive device, and more particularly to a vehicle drive device including a liquid medium supply device for performing at least one of cooling an electric motor, lubricating an electric motor, and lubricating a transmission.

  As a conventional vehicle drive device, the electric vehicle described in Patent Document 1 includes a pair of electric motors on the left and right, a mechanical oil pump between these electric motors, and supplies oil to an oil passage in the drive shaft. It is disclosed that the torque transmission system is lubricated and the traveling motor is cooled by an electric oil pump provided separately. In addition, a strainer for the mechanical oil pump is disposed in the oil sump below the mechanical oil pump, and a strainer for the electric oil pump is disposed in the oil sump behind the electric vehicle. Are arranged closer to the rotation axis than a vertical plane passing through the outermost edge in the radial direction.

JP-A-6-098417

  By the way, in the electric vehicle described in Patent Document 1, the arrangement of the strainer suction port is not described, and the suction port is exposed when the internal oil level is inclined during acceleration, deceleration, turning, etc., and aeration is performed. May occur. In particular, Patent Document 1 does not describe the position of the strainer in the left-right direction.

  The present invention has been made in view of the above problems, and its purpose is to expose the suction port of the liquid fluid supply device even if the oil level changes in the front-rear and left-right directions during acceleration, deceleration, turning, etc. An object of the present invention is to provide a vehicle drive device that can suppress the occurrence of aeration.

In order to achieve the above object, the invention described in claim 1
A first electric motor (for example, a first electric motor 2A in an embodiment described later) that drives a left wheel of the vehicle (for example, a left rear wheel LWr in an embodiment described later);
A first case (e.g., a left reservoir (e.g., a left reservoir RL in an embodiment described later)) that houses the first motor and stores a liquid fluid that is used for lubrication and / or cooling of the first motor. , A first case 11L of an embodiment described later),
A second electric motor (for example, a second electric motor 2B in an embodiment described later) for driving a right wheel of the vehicle (for example, a right rear wheel RWr in an embodiment described later);
A second case (e.g., a right reservoir (e.g., a right reservoir RR in an embodiment described later)) that accommodates the second motor and stores a liquid fluid that is used for lubrication and / or cooling of the second motor. A second case 11R) of an embodiment described later,
With
The first and second motors have the same diameter, the rotation axes of the first and second motors (for example, the rotation axis X of the embodiment described later) are arranged on the same line, and
Between the left reservoir and the right reservoir, a left and right communication passage (for example, a strainer accommodating chamber 105 in an embodiment described later) that communicates the left reservoir and the right reservoir is disposed. A driving device (for example, a rear wheel driving device 1 according to an embodiment described later),
A suction port (for example, a suction port 71b of a strainer 71 in a later-described embodiment) of a liquid fluid supply device (for example, an electric oil pump 70 in a later-described embodiment) used for supplying the liquid fluid is the left and right communication path. Placed in
The suction port is the foremost end (for example, the foremost end Df of the embodiment described later) or the last of the radially outermost edges (for example, the radially outermost edge D of the embodiment described later) of the first and second motors. The first virtual vertical plane (for example, the first virtual vertical plane V1 of the embodiment described later) in contact with the end (for example, the rearmost end Dr of the embodiment described later) is disposed closer to the rotation axis in the front-rear direction of the vehicle. And the 2nd virtual vertical plane (for example, 2nd virtual vertical plane V2 of the below-mentioned embodiment) which passes along the 2nd electric motor side end of the 1st electric motor, and the 1st electric motor side end of the 2nd electric motor A third virtual vertical plane passing through the section (for example, a third virtual vertical plane V3 in the embodiment described later) ,
The left and right communication passages in which the suction port is disposed are formed only on a side where the suction port is disposed in the front-rear direction with respect to the rotation axis .

The invention according to claim 2, in addition to the configuration according to claim 1,
The suction port is arranged between the rotation axis and a middle position in the front-rear direction of the left and right communication passages (for example, a middle position 105c in the front-rear direction in an embodiment described later) when viewed from above.

In addition to the configuration described in claim 1 or 2 , the invention described in claim 3
On the power transmission path between the left wheel and the first electric motor, a first transmission (for example, a first planetary gear speed reducer 12A in an embodiment described later) is disposed.
On the power transmission path between the right wheel and the second electric motor, a second transmission (for example, a second planetary gear speed reducer 12B according to an embodiment described later) is disposed.
The first electric motor and the first transmission are arranged in this order from the outer side in the vehicle width direction, and the second electric motor and the second transmission are arranged in this order from the outer side in the vehicle width direction. The first and second transmissions are disposed between the first and second electric motors;
At least a part of the radially outermost edge of the first transmission and the radially outermost edge of the second transmission have an offset space that is recessed in the radial direction around the periphery (for example, an offset space OS of an embodiment described later). Is formed smaller than the radially outermost edges of the first and second electric motors ,
At least a part of the liquid fluid flow path communicating the liquid fluid supply device and the suction port is disposed in the offset space .

Moreover, in addition to the structure of Claim 3 , the invention of Claim 4 adds to the structure of Claim 3 ,
A strainer (for example, a strainer 71 in an embodiment described later) for filtering the liquid fluid is disposed in the liquid fluid flow path, and at least a part of the strainer is disposed in the offset space. To do.

Moreover, in addition to the structure of Claim 4 , the invention of Claim 5 adds to the structure of Claim 4 ,
The suction port is formed near the tip of the lower portion of the strainer near the rotation axis,
Upper portion of the strainer that is located immediately above the inlet (e.g., the top 71c of the embodiment described later) surface is configured to face at least part of the second transmission and the first transmission, in the vertical direction It is characterized by being inclined with respect to the surface.

In addition to the configuration described in claim 1 or 2 , the invention described in claim 6
On the power transmission path between the left wheel and the first electric motor, a first transmission (for example, a first planetary gear speed reducer 12A in an embodiment described later) is disposed.
On the power transmission path between the right wheel and the second electric motor, a second transmission (for example, a second planetary gear speed reducer 12B according to an embodiment described later) is disposed.
The first electric motor and the first transmission are arranged in this order from the outer side in the vehicle width direction, and the second electric motor and the second transmission are arranged in this order from the outer side in the vehicle width direction. The first and second transmissions are disposed between the first and second electric motors;
At least a part of the radially outermost edge of the first transmission and the radially outermost edge of the second transmission have an offset space that is recessed in the radial direction around the periphery (for example, an offset space OS of an embodiment described later). Is formed smaller than the radially outermost edges of the first and second electric motors,
One of the first transmission and the second transmission is connected to a braking means (for example, a hydraulic brake 60 in an embodiment described later),
The braking means is disposed on the outer periphery of the radially outermost edge of the one transmission ,
At least a part of a strainer that is provided in a liquid fluid flow path that communicates the liquid fluid supply device and the suction port and performs filtration of the liquid fluid is disposed in the offset space,
The upper surface of the strainer has a shape having two planes (for example, planes 71c1 and 71c2 in an embodiment described later) that bend at the apex (for example, an apex 71c3 in an embodiment described later) as a boundary. And
The apex is formed to be deviated from the center of the strainer in the left-right direction (for example, the center C in the left-right direction of the strainer 71 of the embodiment described later) on the side where the braking means is not disposed.

Moreover, in addition to the structure of any one of Claims 1-6 , invention of Claim 7 is provided,
The suction port is disposed at a position that intersects with a virtual intermediate plane (for example, a virtual intermediate plane P in an embodiment described later) that is orthogonal to the rotational axis direction and is equidistant from the first and second motors. It is characterized by being.
Moreover, in addition to the structure of any one of Claims 1-7, invention of Claim 8 is provided,
The suction port is positioned below the rotation axis in the vertical direction, and is disposed near the bottom of the left and right communication paths (for example, the bottom wall 103 of the embodiment described later),
The suction port is open toward the bottom of the left and right communication passages.

The invention according to claim 9 is
A first drive source (for example, a first electric motor 2A in an embodiment described later) for driving a left wheel of the vehicle (for example, a left rear wheel LWr in an embodiment described later);
A first transmission provided on a power transmission path between the left wheel and the first drive source (for example, a first planetary gear speed reducer 12A in an embodiment described later);
A left reservoir that houses the first drive source and the first transmission and stores a liquid fluid that is used for lubrication and / or cooling of the first transmission (for example, a left reservoir in an embodiment described later) (RL)) (for example, a first case 11L of the embodiment described later),
A second drive source (for example, a second electric motor 2B of an embodiment described later) for driving a right wheel of the vehicle (for example, a right rear wheel RWr of an embodiment described later);
A second transmission provided on a power transmission path between the right wheel and the second drive source (for example, a second planetary gear speed reducer 12B in an embodiment described later);
A right reservoir that accommodates the second drive source and the second transmission and stores a liquid fluid that is used for lubrication and / or cooling of the second transmission (for example, a right reservoir in an embodiment described later) RR) (for example, a second case 11R in an embodiment described later),
With
The first and second transmissions have the same diameter, and the rotation axes of the first and second transmissions and the rotation axes of the first and second drive sources (for example, the rotation axis X of the embodiment described later) are provided. Arranged on the same line,
The first transmission and the first drive source are arranged in this order from the outside in the vehicle width direction, and the second transmission and the second drive source are arranged in this order from the outside in the vehicle width direction. Thus, the first and second drive sources are disposed between the first and second transmissions,
Between the left reservoir and the right reservoir, a left and right communication passage (for example, a strainer accommodating chamber 105 in an embodiment described later) that communicates the left reservoir and the right reservoir is disposed. A driving device (for example, a rear wheel driving device 1 according to an embodiment described later),
An inlet (for example, an inlet 71b in an embodiment described later) of the liquid fluid supply device used for supplying the liquid fluid is disposed in the left and right communication passages,
The suction port is a frontmost end (for example, a frontmost end Df ′ of a later-described embodiment) of a radially outermost edge (for example, a radially outermost edge D ′ of a later-described embodiment) of the first and second transmissions. ) Or the first virtual vertical plane (for example, the first virtual vertical plane V1 ′ of the embodiment described later) in contact with the rear end (for example, the rearmost end Dr ′ of the embodiment described later) in the front-rear direction of the vehicle. A second virtual vertical plane (for example, a second virtual vertical plane V2 ′ in an embodiment described later) disposed near the axis and passing through the second transmission side end of the first transmission; and the second It is arranged between a third virtual vertical plane (for example, a third virtual vertical plane V3 ′ in an embodiment described later) passing through the first transmission side end of the transmission ,
The left and right communication passages in which the suction port is disposed are formed only on a side where the suction port is disposed in the front-rear direction with respect to the rotation axis .

Moreover, in addition to the structure of Claim 9 , the invention of Claim 10 adds to the structure of Claim 9 ,
The suction port is arranged between the rotation axis and a middle position in the front-rear direction of the left and right communication passages (for example, a middle position 105c in the front-rear direction in an embodiment described later) when viewed from above.

Further, an invention according to claim 11, in addition to the configuration according to claim 9 or 10,
At least a part of the radially outermost edge of the first drive source and the radially outermost edge of the second drive source are offset spaces that are recessed in the radial direction around the periphery (for example, an offset space OS of an embodiment described later). Is formed smaller than the radially outermost edges of the first and second transmissions ,
At least a part of the liquid fluid flow path communicating the liquid fluid supply device and the suction port is disposed in the offset space .

Moreover, in addition to the structure of Claim 11 , the invention of Claim 12 is
A strainer (for example, a strainer 71 in an embodiment described later) for filtering the liquid fluid is disposed in the liquid fluid flow path, and at least a part of the strainer is disposed in the offset space. To do.

Moreover, in addition to the structure of Claim 12 , the invention of Claim 13 is
The suction port is formed near the tip of the lower portion of the strainer near the rotation axis,
The upper surface of the strainer located immediately above the suction port faces at least a part of each outer edge of the radially outermost edge of the first drive source and the radially outermost edge of the second drive source, and It is formed to be inclined with respect to the vertical direction.
Moreover, in addition to the structure of any one of Claims 9-13, the invention of Claim 14 is provided.
The inlet is perpendicular to the rotational axis direction and intersects with a virtual median plane (for example, a virtual median plane P in an embodiment described later) that is equidistant from the first and second drive sources. It is characterized by being arranged.
Moreover, in addition to the structure as described in any one of Claims 9-14, invention of Claim 15 is provided.
The suction port is positioned below the rotation axis in the vertical direction, and is disposed near the bottom of the left and right communication paths (for example, the bottom wall 103 of the embodiment described later),
The suction port is open toward the bottom of the left and right communication passages.

According to the first aspect of the present invention, since the suction port of the liquid fluid supply device is disposed in the vicinity of the center in the front-rear direction and in the vicinity of the center in the left-right direction of the drive device having two electric motors on the left and right sides, acceleration and deceleration Even if the liquid level changes in the front-rear and left-right directions due to turning or the like, the suction port can be prevented from being exposed above the liquid level, and aeration can be prevented.
In addition, since the suction port is disposed closer to the rotational axis in the front-rear direction of the vehicle than the foremost end or the rearmost end of the radially outermost edges of the first and second electric motors, the drive device can be reduced in size.
Moreover, since the left and right communication paths are formed only on one side in the front-rear direction with respect to the rotation axis, the bottom area of the left and right communication paths is limited in the front-rear direction, and the depth of the liquid fluid can be increased. As a result, exposure of the suction port is further suppressed, and aeration can be further prevented. Further, the space on the other side in the front-rear direction with respect to the rotation axis, in which the left and right communication paths are not formed, can be effectively used by installing other members, and the degree of design freedom can be improved.

According to the second aspect of the present invention, since the suction port is disposed on the side closer to the rotation axis in the left and right communication paths, the suction port can be further suppressed from being exposed above the liquid level. The occurrence of aeration can be further prevented.

According to the third aspect of the present invention, the offset space is provided around at least a part of the radially outermost edge of the first transmission and the radially outermost edge of the second transmission, and the offset space is effectively used. By using it, the drive device can be reduced in size.
Further, by arranging the liquid fluid flow path by utilizing the offset space, the suction port can be brought closer to the rotation axis in the front-rear direction, and the entire apparatus can be prevented from being enlarged in the radial direction.

According to the invention described in claim 4 , by arranging the strainer by utilizing the offset space, it is possible to suppress the entire apparatus from being enlarged in the radial direction by the strainer.

According to the fifth aspect of the present invention, the suction port provided in the strainer can be brought closer to the rotation axis in the front-rear direction, and aeration can be further prevented.

According to the sixth aspect of the present invention , the offset space is provided around at least a part of the radially outermost edge of the first transmission and the radially outermost edge of the second transmission, and the offset space is effectively used. By using it, the drive device can be reduced in size.
Further, even when the braking means is provided, an offset space is provided around at least a part of the radially outermost edge of the first transmission and the radially outermost edge of the second transmission, and the offset space is effectively used. By using it, the drive device can be reduced in size.
In addition, the strainer can be arranged by utilizing the offset space where the braking means is not arranged while avoiding the braking means, and the entire apparatus can be enlarged in the radial direction without leaving the entire strainer from the rotation axis. Can be suppressed.

According to the seventh aspect of the invention, since the suction port is arranged closer to the center in the left-right direction, the suction port is exposed above the liquid level even if the liquid level changes in the left-right direction due to turning. Can be further suppressed, and the occurrence of aeration can be further prevented.
According to the eighth aspect of the present invention, since the suction port is disposed near the bottom of the left and right communication passages, it is possible to further suppress the suction port from being exposed above the liquid level and to prevent generation of aeration. More can be prevented. Further, the suction port is difficult to be exposed above the liquid level with respect to the liquid level that changes during traveling, and aeration can be prevented.

According to the ninth aspect of the present invention, the suction port of the liquid fluid supply device is disposed in the vicinity of the center in the front-rear direction of the drive device having the two drive sources and the transmission in the left-right direction and in the vicinity of the center in the left-right direction. Therefore, even if the liquid level changes in the front-rear and left-right directions due to acceleration, deceleration, turning, etc., the suction port can be prevented from being exposed above the liquid level, and aeration can be prevented.
In addition, since the suction port is disposed closer to the rotation axis in the longitudinal direction of the vehicle than the foremost end or the rearmost end of the radially outermost edge of the first and second transmissions, the drive device can be reduced in size. .
Moreover, since the left and right communication paths are formed only on one side in the front-rear direction with respect to the rotation axis, the bottom area of the left and right communication paths is limited in the front-rear direction, and the depth of the liquid fluid can be increased. As a result, exposure of the suction port is further suppressed, and aeration can be further prevented. Further, the space on the other side in the front-rear direction with respect to the rotation axis, in which the left and right communication paths are not formed, can be effectively used by installing other members, and the degree of design freedom can be improved.

According to the tenth aspect of the present invention, since the suction port is disposed on the side closer to the rotation axis in the left and right communication paths, the suction port can be further suppressed from being exposed above the liquid level. The occurrence of aeration can be further prevented.

According to the eleventh aspect of the present invention, the offset space is provided around at least a part of the radially outermost edge of the first drive source and the radially outermost edge of the second drive source, and the offset space is effectively used. By using it, the drive device can be reduced in size.
Further, by arranging the liquid fluid flow path by utilizing the offset space, the suction port can be brought closer to the rotation axis in the front-rear direction, and the entire apparatus can be prevented from being enlarged in the radial direction.

According to the twelfth aspect of the present invention, it is possible to suppress the entire apparatus from being enlarged in the radial direction by the strainer by arranging the strainer by utilizing the offset space.

According to the thirteenth aspect of the present invention, the suction port provided in the strainer can be brought closer to the rotation axis in the front-rear direction, and aeration can be further prevented.
According to the fourteenth aspect of the present invention, since the suction port is arranged closer to the center in the left-right direction, even if the liquid level changes in the left-right direction due to turning, the suction port is exposed above the liquid level. Can be further suppressed, and the occurrence of aeration can be further prevented.
According to the fifteenth aspect of the present invention, since the suction port is disposed near the bottom of the left and right communication passages, it is possible to further suppress the suction port from being exposed above the liquid level, and to prevent generation of aeration. More can be prevented. Further, the suction port is difficult to be exposed above the liquid level with respect to the liquid level that changes during traveling, and aeration can be prevented.

1 is a block diagram showing a schematic configuration of a hybrid vehicle that is an embodiment of a vehicle on which a vehicle drive device according to the present invention can be mounted. It is a longitudinal cross-sectional view of the rear-wheel drive device of one Embodiment along the II-II line | wire shown in FIG. FIG. 3 is an enlarged partial sectional view of an upper portion of the rear wheel drive device shown in FIG. 2. It is a perspective view which shows the state in which the vehicle drive device of FIG. 1 was mounted in the flame | frame. It is an external appearance perspective view of the rear-wheel drive device from which the electric oil pump was removed. It is the perspective view which looked at the cover member to which the electric oil pump was attached from the inside. It is a side view of the rear-wheel drive device which shows the state to which the electric oil pump was attached. It is a front view of the rear-wheel drive device which shows the state by which the strainer is arrange | positioned in the strainer accommodation chamber. It is sectional drawing of the rear-wheel drive device along the IX-IX line of FIG. It is sectional drawing of the rear-wheel drive device along the XX line of FIG. (A) is a figure which shows the stationary oil level with respect to the strainer at the time of the left turn with a regular oil quantity, (b) is a figure which shows the stationary oil level with respect to the strainer at the time of the right turn with a regular oil quantity. . (A) is a figure which shows the static oil level with respect to the strainer at the time of acceleration with a normal oil quantity, (b) is a figure which shows the static oil level with respect to the strainer at the time of deceleration with a normal oil quantity. It is a perspective view which shows typically the rear-wheel drive device which concerns on the modification of this embodiment. (A) is a top view schematically showing the rear wheel drive device of FIG. 13, (b) is a front view thereof, and (c) is a side view thereof.

The vehicle drive device according to the present invention uses an electric motor as a drive source for driving wheels, and is used, for example, in a vehicle having a drive system as shown in FIG. In the following description, the case where the vehicle drive device is used for rear wheel drive will be described as an example, but it may be used for front wheel drive.
A vehicle 3 shown in FIG. 1 is a hybrid vehicle having a drive device 6 (hereinafter referred to as a front wheel drive device) in which an internal combustion engine 4 and an electric motor 5 are connected in series at the front portion of the vehicle. Is transmitted to the front wheels Wf via the transmission 7, while the power of the driving device 1 (hereinafter referred to as a rear wheel driving device) provided at the rear of the vehicle separately from the front wheel driving device 6 is the rear wheel Wr. (RWr, LWr). The electric motor 5 of the front wheel drive device 6 and the first and second electric motors 2A, 2B of the rear wheel drive device 1 are connected to the battery 9 so that power supply from the battery 9 and energy regeneration to the battery 9 are possible. It has become. In FIG. 1, reference numeral 8 denotes a control device for controlling the entire vehicle.

First, a vehicle drive device according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 2 is a longitudinal sectional view of the entire rear wheel drive device 1, and FIG. 3 is an enlarged partial sectional view of the upper part of FIG. In the figure, reference numeral 11 denotes a case of the rear wheel drive device 1, and the case 11 is arranged on the left and right sides of the central case 11 </ b> M so as to sandwich the central case 11 </ b> M and the central case 11 </ b> M. It is comprised from the side cases 11A and 11B arrange | positioned, and the whole is formed in a substantially cylindrical shape. Inside the case 11 are axles 10A and 10B for the rear wheels Wr, first and second electric motors 2A and 2B for driving the axles, and first and second shifts for decelerating the driving rotation of the electric motors 2A and 2B. First and second planetary gear type speed reducers 12A and 12B as machines are arranged side by side on the same axis. The axle 10A, the first electric motor 2A and the first planetary gear speed reducer 12A drive and control the left rear wheel LWr, and the axle 10B, the second electric motor 2B and the second planetary gear speed reducer 12B drive the right rear wheel RWr. Control. The axle 10A, the first electric motor 2A and the first planetary gear speed reducer 12A, and the axle 10B, the second electric motor 2B and the second planetary gear speed reducer 12B are arranged symmetrically in the vehicle width direction in the case 11. Yes. The left rear wheel LWr is positioned opposite to the first planetary gear type reduction gear 12A with respect to the first electric motor 2A, and the right rear wheel RWr is also connected to the second planetary gear type reduction gear 12B with respect to the second electric motor 2B. Located on the opposite side. The first electric motor 2A and the first planetary gear type speed reducer 12A are arranged in this order from the outer side in the vehicle width direction, and the second electric motor 2B and the second planetary gear type speed reducer 12B are arranged from the outer side in the vehicle width direction. By arrange | positioning in this order, 1st and 2nd planetary gear type reduction gears 12A and 12B are arrange | positioned between 1st and 2nd electric motor 2A, 2B.

  The side cases 11A and 11B are respectively provided with partition walls 18A and 18B extending radially inward on the central case 11M side. Between the side cases 11A and 11B and the partition walls 18A and 18B, first and first partitions are provided. Two electric motors 2A and 2B are arranged. Further, first and second planetary gear speed reducers 12A and 12B are arranged in a space surrounded by the central case 11M and the partition walls 18A and 18B. As shown in FIG. 2, in this embodiment, the left side case 11A and the center case 11M constitute a first case 11L that houses the first electric motor 2A and the first planetary gear type speed reducer 12A. The right side case 11B and the center case 11M constitute a second case 11R that houses the second electric motor 2B and the second planetary gear type speed reducer 12B. The first case 11L includes a left reservoir RL that stores oil as a liquid medium that is used for lubrication and / or cooling of at least one of the first electric motor 2A and the power transmission path, and the second case 11R includes The second electric motor 2B and the right storage part RR that stores oil used for lubrication and / or cooling of at least one of the power transmission paths are provided. As shown in FIG. 4, the case 11 is supported by support portions 13 a and 13 b of a frame member 13 that is a part of a frame that is a skeleton of the vehicle 3 and a frame of the drive device 1 (not shown). . The support portions 13a and 13b are provided on the left and right with respect to the center of the frame member 13 in the vehicle width direction. Moreover, the arrow in FIGS. 2-12 has shown the positional relationship in the state in which the rear-wheel drive device 1 was mounted in the vehicle.

  The rear wheel drive device 1 is provided with a breather device 40 that communicates the inside and the outside of the case 11 so that the air inside is not exposed to the outside through the breather chamber 41 so that the air inside does not become excessively high temperature and pressure. Configured to escape. The breather chamber 41 is disposed at the upper part in the vertical direction of the case 11, and includes an outer wall of the central case 11M, a first cylindrical wall 43 extending substantially horizontally in the central case 11M on the left side case 11A side, and a right side case. A second cylindrical wall 44 extending substantially horizontally on the 11B side, a left and right dividing wall 45 connecting the inner ends of the first and second cylindrical walls 43, 44, and a left side case 11A of the first cylindrical wall 43. A space formed by a baffle plate 47A attached so as to abut on the side tip, and a baffle plate 47B attached so as to abut on the right side case 11B side tip of the second cylindrical wall 44. The

  The first and second cylindrical walls 43 and 44 and the left and right dividing walls 45 forming the lower surface of the breather chamber 41 are such that the first cylindrical wall 43 is located radially inward from the second cylindrical wall 44 and the left and right dividing walls 45 are The third cylindrical wall 44 extends from the inner end portion of the second cylindrical wall 44 to the inner end portion of the first cylindrical wall 43 while being bent while being reduced in diameter, and further extends radially inward to extend substantially horizontally. The cylindrical wall 46 is reached. The third cylindrical wall 46 is located inside and substantially in the center from both outer ends of the first cylindrical wall 43 and the second cylindrical wall 44.

  In the central case 11M, baffle plates 47A, 47B are planetary gear type in a space between the first cylindrical wall 43 and the outer wall of the central case 11M or a space between the second cylindrical wall 44 and the outer wall of the central case 11M. It is fixed so as to be separated from the speed reducer 12A or the planetary gear type speed reducer 12B.

  In addition, an external communication path 49 that connects the breather chamber 41 and the outside is connected to the central case 11M on the upper surface in the vertical direction of the breather chamber 41. The breather chamber side end portion 49a of the external communication passage 49 is arranged so as to be directed downward in the vertical direction. Accordingly, the oil is prevented from being discharged to the outside through the external communication passage 49.

  In the first and second electric motors 2A and 2B, stators 14A and 14B are fixed to side cases 11A and 11B, respectively, and annular rotors 15A and 15B are rotatably arranged on the inner peripheral sides of the stators 14A and 14B. Yes. Cylindrical shafts 16A and 16B surrounding the outer periphery of the axles 10A and 10B are coupled to the inner peripheral portions of the rotors 15A and 15B, and the cylindrical shafts 16A and 16B can be relatively rotated coaxially with the axles 10A and 10B. The side cases 11A and 11B are supported by end walls 17A and 17B and partition walls 18A and 18B via bearings 19A and 19B. Further, the rotation position information of the rotors 15A and 15B is fed back to the control controllers (not shown) of the electric motors 2A and 2B on the end walls 17A and 17B on the outer periphery on one end side of the cylindrical shafts 16A and 16B. Resolvers 20A and 20B are provided. The first and second electric motors 2A and 2B including the stators 14A and 14B and the rotors 15A and 15B have the same diameter, and the rotation axes of the first and second electric motors 2A and 2B are arranged on the same line X (hereinafter referred to as “the same”). , X is attached as the rotation axis X.) Also, the first and second electric motors 2A and 2B are arranged in mirror symmetry with each other. The axle 10A and the cylindrical shaft 16A pass through the first electric motor 2A and extend from both ends of the first electric motor 2A. The axle 10B and the cylindrical shaft 16B also penetrate the second electric motor 2B. , Extending from both ends of the second electric motor 2B.

  Further, the first planetary gear type speed reducer 12A disposed on the power transmission path between the left rear wheel LWr and the first motor 2A, and the power transmission path between the right rear wheel RWr and the second motor 2B. The second planetary gear speed reducer 12B includes sun gears 21A and 21B, a plurality of planetary gears 22A and 22B meshed with the sun gears 21A and 21B, planetary carriers 23A and 23B that support the planetary gears 22A and 22B, and planetary gears. Ring gears 24A and 24B meshed with the outer peripheral sides of 22A and 22B, the driving forces of the electric motors 2A and 2B are input from the sun gears 21A and 21B, and the reduced driving forces are transmitted through the planetary carriers 23A and 23B to the axles 10A, 10B is output.

  The sun gears 21A and 21B are formed integrally with the cylindrical shafts 16A and 16B. The planetary gears 22A and 22B are double pinions having first pinions 26A and 26B having large diameters directly meshed with the sun gears 21A and 21B, and second pinions 27A and 27B having smaller diameters than the first pinions 26A and 26B. The first pinions 26A and 26B and the second pinions 27A and 27B are integrally formed in a state of being coaxial and offset in the axial direction. The planetary gears 22A and 22B are supported by the pinion shafts 32A and 32B of the planetary carriers 23A and 23B via needle bearings 31A and 31B. 10B and is supported by the partition walls 18A and 18B via bearings 33A and 33B.

  The ring gears 24A and 24B have gear portions 28A and 28B that are meshed with the second pinions 27A and 27B whose inner peripheral surfaces are small diameters, and small diameters that are smaller than the gear portions 28A and 28B and that are opposed to each other at an intermediate position of the case 11. Parts 29A, 29B, and connecting parts 30A, 30B for connecting the axially inner ends of the gear parts 28A, 28B and the axially outer ends of the small diameter parts 29A, 29B in the radial direction.

  The gear portions 28A and 28B face each other in the axial direction with a third cylindrical wall 46 formed at the inner diameter side end portion of the left and right dividing wall 45 of the central case 11M. The outer diameter surfaces of the small diameter portions 29A and 29B are spline-fitted to an inner race 51 of a one-way clutch 50, which will be described later, and the ring gears 24A and 24B are connected to each other so as to rotate integrally with the inner race 51 of the one-way clutch 50. Configured.

  On the planetary gear type speed reducer 12B side, between the second cylindrical wall 44 of the central case 11M constituting the case 11 and the gear portion 28B of the ring gear 24B, the hydraulic pressure is connected to the ring gear 24B and constitutes the braking means. The brake 60 is arranged so as to overlap the first pinion 26B in the radial direction and overlap the second pinion 27B in the axial direction. The hydraulic brake 60 includes a plurality of fixed plates 35 that are spline-fitted to the inner peripheral surface of the second cylindrical wall 44 and a plurality of rotary plates 36 that are spline-fitted to the outer peripheral surface of the gear portion 28B of the ring gear 24B. The plates 35 and 36 are arranged alternately in the directions, and are fastened and released by an annular piston 37. The piston 37 is accommodated in an annular cylinder chamber formed between the left and right dividing walls 45 of the central case 11M and the third cylindrical wall 46, and is provided on the outer peripheral surface of the third cylindrical wall 46. By the elastic member 39 supported by the receiving seat 38, the fixed plate 35 and the rotating plate 36 are always urged in the releasing direction.

  More specifically, the working chamber S into which oil is directly introduced is defined between the left and right dividing walls 45 and the piston 37, and when the pressure of the oil introduced into the working chamber S exceeds the urging force of the elastic member 39, The piston 37 moves forward (to the right), and the fixed plate 35 and the rotating plate 36 are pressed against each other and fastened. When the urging force of the elastic member 39 exceeds the pressure of the oil introduced into the working chamber S, the piston 37 moves backward (leftward movement), and the fixed plate 35 and the rotating plate 36 are separated and released. . The hydraulic brake 60 is connected to an electric oil pump 70 (see FIG. 4) as a liquid medium supply device.

  In the case of this hydraulic brake 60, the fixed plate 35 is supported by the second cylindrical wall 44 extending from the left and right dividing walls 45 of the central case 11M constituting the case 11, while the rotating plate 36 is supported by the gear portion 28B of the ring gear 24B. Therefore, when the plates 35 and 36 are pressed by the piston 37, a braking force is applied to the ring gear 24B by the frictional engagement between the plates 35 and 36, and is fixed. When the fastening by the piston 37 is released from this state, the ring gear 24B is allowed to rotate freely. As described above, since the ring gears 24A and 24B are connected to each other, the braking force is also applied to the ring gear 24A when the hydraulic brake 60 is fastened, and the ring gear 24A is fixed when the hydraulic brake 60 is released. Free rotation is allowed.

  Also, a space is secured between the coupling portions 30A and 30B of the ring gears 24A and 24B facing each other in the axial direction, and only power in one direction is transmitted to the ring gears 24A and 24B in the space to transmit power in the other direction. A one-way clutch 50 is arranged to be shut off. The one-way clutch 50 has a large number of sprags 53 interposed between an inner race 51 and an outer race 52. The inner race 51 is connected to the small diameter portions 29A, 29B of the ring gears 24A, 24B by spline fitting. It is configured to rotate integrally. The outer race 52 is positioned by the third cylindrical wall 46 and is prevented from rotating.

  The one-way clutch 50 is configured to engage and lock the rotation of the ring gears 24A and 24B when the vehicle 3 moves forward with the power of the electric motors 2A and 2B. More specifically, the one-way clutch 50 is engaged when rotational power in the forward direction on the motors 2A, 2B side (rotation direction when the vehicle 3 is advanced) is input to the wheel Wr side. When the rotational power in the reverse direction on the electric motors 2A and 2B is input to the wheels Wr, the non-engagement state is established, and when the rotational power in the forward direction on the wheels Wr is input to the electric motors 2A and 2B, it is not engaged. The engaged state is established when the rotating power in the reverse direction on the wheel Wr side is input to the electric motors 2A, 2B while being engaged.

Thus, in the rear wheel drive device 1 of the present embodiment, the one-way clutch 50 and the hydraulic brake 60 are provided in parallel on the power transmission path between the electric motors 2A, 2B and the wheels Wr. It should be noted that the hydraulic brake 60 is released, weakly engaged, or engaged by the pressure of oil supplied from the oil pump 70 according to the running state of the vehicle and the engaged / disengaged state of the one-way clutch 50. Be controlled. For example, when the vehicle 3 moves forward by powering drive of the electric motors 2A and 2B (at low vehicle speed and medium vehicle speed), the one-way clutch 50 is engaged, so that power can be transmitted but the hydraulic brake 60 is weakly engaged. Therefore, even when the input of forward rotational power from the motors 2A and 2B side temporarily decreases and the one-way clutch 50 is disengaged, the motors 2A and 2B Inability to transmit power to the wheel Wr side is suppressed. Further, when the vehicle 3 moves forward by power driving of the internal combustion engine 4 and / or the electric motor 5 (at the time of high vehicle speed), the one-way clutch 50 is disengaged and the hydraulic brake is controlled to be in a released state, so that the electric motor Over-rotation of 2A and 2B is prevented. On the other hand, when the vehicle 3 moves backward or regenerates, the one-way clutch 50 is disengaged, so that the hydraulic brake 60 is controlled to be in the engaged state, so that the rotational power in the reverse direction from the electric motors 2A and 2B is changed to the wheels Wr. Or forward rotational power on the wheel Wr side is input to the electric motors 2A and 2B.

  Further, as shown in FIGS. 5 and 8, the outer peripheral surfaces of the first and second cylindrical walls 43, 44 and the left and right dividing walls 45 of the central case 11 </ b> M are exposed to the outside at portions other than forming the breather chamber 41. On the outer peripheral surfaces of the first and second cylindrical walls 43, 44 and the left and right dividing walls 45, a pair of projecting portions 101, 102 projecting radially from both axial end portions are formed.

  Then, around the first and second cylindrical walls 43, 44 and the left and right dividing walls 45, a substantially square shape is formed by a pair of projecting portions 101, 102, a bottom wall 103, and an upper wall 104 obliquely forward and downward. A strainer accommodating chamber 105 is formed as a left and right communication path that is defined in a cylindrical shape and accommodates a strainer 71 described later.

  That is, as shown also in FIG. 9, the radially outermost edge of the first planetary gear speed reducer 12A and the radially outermost edge of the second planetary gear speed reducer 12B are the same as those of the first and second electric motors 2A and 2B. The first and second cylindrical walls are formed smaller than the radially outermost edge D and cover the radially outermost edge of the first planetary gear speed reducer 12A and the radially outermost edge of the second planetary gear speed reducer 12B. The outer peripheral surfaces of 43 and 44 and the left and right dividing walls 45 are provided with an offset space OS that is recessed in the radial direction around the periphery, and the strainer accommodating chamber 105 is arranged using this offset space OS.

  Accordingly, at least a part of the strainer accommodating chamber 105 is disposed between the foremost end Df and the rearmost end Dr of the radially outermost edge D of the first and second electric motors 2A, 2B in the front-rear direction. Further, the strainer accommodating chamber 105 is partitioned in the front-rear direction by the outer peripheral surfaces of the first and second cylindrical walls 43, 44 and the left and right dividing walls 45 and the standing wall 99 formed below these outer peripheral surfaces. It is formed on the foremost end Df side of the radially outermost edge D of the first and second electric motors 2A, 2B with respect to the rotation axis X in the front-rear direction.

  The front opening 105a of the strainer accommodating chamber 105 is closed by fastening and fixing a lid member 72 to which the electric oil pump 70 is attached with a plurality of bolts 106, and the inner wall surface of the lid member 72 is the strainer accommodating chamber. 105 wall surfaces are formed. The discharge port 71a of the strainer 71 is connected to the electric oil pump 70. Therefore, the strainer 71 is fastened and fixed to the front opening 105a of the strainer housing chamber 105 by the lid member 72 to which the electric oil pump 70 is attached. The strainer storage chamber 105 is disposed.

  The pair of overhanging portions 101 and 102 forming the strainer accommodating chamber 105 has through holes 107a and 107b (see FIG. 5) as left middle communication passages that connect the left reservoir RL and the strainer accommodating chamber 105, and a right reservoir. A through hole 107c (see FIG. 9) is formed as a right middle communication passage that communicates the portion RR and the strainer accommodating chamber 105. Thereby, the strainer accommodating chamber 105 which is a left and right communication path disposed between the left reservoir RL and the right reservoir RR communicates the left reservoir RL and the right reservoir RR.

  Furthermore, as shown in FIG. 10, a drain passage 121 that penetrates in the front-rear direction facing the strainer accommodating chamber 105 is formed in the lower standing wall 99, and the rear end of the drain passage 121 is formed by a drain bolt 122. The oil is discharged to the outside by removing the drain bolt 122 after being blocked. In addition, the lower standing wall 99 has no suction port 71b with respect to the rotation axis X. The rearmost Dr side of the radially outermost edge D of the first and second electric motors 2A and 2B in the front-rear direction. In addition, another left and right communication passage 120 that intersects the drain passage 121 and penetrates in the vehicle width direction and communicates the left reservoir RL and the right reservoir RR is formed. The other left and right communication passages 120 are provided in order to further improve the fluidity between the left reservoir RL and the right reservoir RR.

  As shown in FIGS. 9 and 10, the suction port 71 b of the strainer 71 disposed in the strainer accommodating chamber 105 is formed near the tip of the lower portion of the strainer 71 near the rotation axis X. Therefore, as shown in FIGS. 5, 8 and 9, the suction port 71 b is from a first virtual vertical plane V <b> 1 in contact with the foremost end Df of the radially outermost edge D of the first and second electric motors 2 </ b> A, 2 </ b> B. Is also arranged near the rotation axis X in the front-rear direction, and a third virtual vertical plane V2 passing through the second motor side end of the first motor 2A and a third motor side end passing through the first motor side end of the second motor 2B. It arrange | positions between virtual vertical plane V3.

  The suction port 71b is disposed at a position that intersects the virtual intermediate plane P that is orthogonal to the rotation axis X direction and is equidistant from the first and second electric motors 2A and 2B.

  More specifically, as shown in FIG. 9, the suction port 71b is disposed between the rotation axis X and the intermediate position 105c in the front-rear direction of the strainer accommodating chamber 105 in a side view, and the suction port 71b Further, it is positioned below the rotation axis X in the vertical direction, and is disposed near the bottom wall 103 of the strainer accommodating chamber 105 so as to open toward the bottom wall 103. The suction port 71b is formed on the lower surface of the strainer 71 at a position closer to the rotation axis X than the intermediate position on the lower surface in the front-rear direction and including the horizontal center C of the strainer 71.

  As shown in FIGS. 8 and 9, the surface of the upper portion 71c of the strainer 71 located immediately above the suction port 71b is opposed to the first planetary gear speed reducer 12A and the second planetary gear speed reducer 12B, and is vertically Inclined with respect to the direction. Specifically, the inclined surface of the upper portion 71c of the strainer 71 includes the first cylindrical wall 43 covering the first planetary gear type speed reducer 12A, the outer circumference of the second planetary gear type speed reducer 12B, and the radially outermost edge thereof. It opposes the 2nd cylindrical wall 44 which covers the hydraulic brake 60 arrange | positioned in this.

  Further, as described above, since the hydraulic brake 60 is disposed on the outer periphery of the radially outermost edge of the second planetary gear speed reducer 12B, the second cylindrical wall 44 projects outward in the radial direction compared to the first cylindrical wall 43. ing. For this reason, as shown in FIG. 11, the surface of the upper portion 71 c of the strainer 71 has a shape having two planes 71 c 1 and 71 c 2 that bend at the vertex 71 c 3 as viewed in the front-rear direction. With respect to the direction center C, it is formed eccentrically on the first cylindrical wall 43 side where the hydraulic brake 60 is not disposed.

  Accordingly, the suction port 71b of the strainer 71 is disposed in the strainer accommodating chamber 105 in the vicinity of the center in the front-rear direction and in the vicinity of the center in the left-right direction, for example, as shown in FIG. During such a left turn or a right turn as shown in FIG. 11 (b), the suction port 71b is not exposed above the liquid level S, and the acceleration as shown in FIG. 12 (a). The suction port 71b is not exposed above the liquid level S even during deceleration or during deceleration as shown in FIG.

  The strainer 71 configured as described above removes foreign matter from the oil sucked from the suction port 71 b provided on the lower surface thereof, and the oil from which the foreign matter has been removed is sent to the electric oil pump 70.

  As shown in FIGS. 6 and 7, the electric oil pump 70 is a so-called trochoid pump, which is driven by another electric motor 90 composed of a position sensorless brushless DC motor, and has at least two modes of a high pressure mode and a low pressure mode. It is possible to operate with and is controlled by PID control. Then, a fluid suction path 94 which is a liquid fluid flow path provided from the strainer 71 into the electric oil pump 70 while adjusting the discharge amount by rotating an unillustrated inner rotor or outer rotor provided in the suction portion 93. The fluid flowing into the fluid is discharged to a fluid discharge path (not shown).

  As shown in FIG. 6, an oil passage forming cover 96 that defines a part of the oil passage of the hydraulic circuit is fixed with bolts 69 inside the lid member 72 together with the lid member 72. Between the lid member 72 and the oil passage forming cover 96, a low pressure oil passage switching valve 73, a brake oil passage switching valve 74, and a relief valve 84 are arranged in the hydraulic circuit in order from the bottom. 7, a solenoid valve 83 disposed in the hydraulic circuit is attached to the side of the lid member 72 opposite to the oil passage forming cover 96.

  Therefore, at least a part of the liquid suction path 94 that communicates the electric oil pump 70 and the suction port 71b (in this embodiment, the liquid suction path formed in the strainer 71) is also disposed in the offset space OS.

  Also, the oil passage forming cover 96 has a brake oil passage working chamber port 108a formed on the outer peripheral surface of the central case 11M in the strainer accommodating chamber 105, and a cooling / lubrication of a front vertical oil passage 109 described later. Two outlet pipes 97a and 97b, which are respectively connected to the working port 108b, are attached.

  As described above, the outlet pipes 97a and 97b are connected to the working chamber port 108a and the cooling / cooling member 72 in a state where the lid member 72 to which the electric oil pump 70 is attached is attached to the front opening 105a of the strainer accommodating chamber 105. Each is connected to the lubrication port 108b.

  The case 11 is formed with a brake oil passage (not shown) that communicates from the working chamber port 108 a to the working chamber S of the hydraulic brake 60, and is supplied with oil discharged from the electric oil pump 70. Further, the case 11 includes a front vertical oil passage 109 extending in the vertical direction from the cooling / lubricating port 108b in the front portion of the central case 11M, a left case oil passage 110A branched from the front vertical oil passage 109, and a right case oil passage. 110B. The left case oil passage 110A is formed such that oil passing through the oil passage 110A cools the coil of the stator 14A of the first electric motor 2A and lubricates the bearing 19A of the first electric motor 2A. It is formed so as to communicate with the left axle oil passage 111A provided in 10A. The oil passing through the left axle oil passage 111A lubricates the needle bearing 31A of the first planetary gear speed reducer 12A, the meshing portions of the gears 21A, 22A, 23A, 24A, and the like.

  The right case oil passage 110B is also formed so that the oil passing through the oil passage 110B cools the coil of the stator 14B of the second electric motor 2B and lubricates the bearing 19B of the second electric motor 2B. The right axle oil passage 111B provided on the axle 10B is formed so as to communicate with the right axle axle passage. The oil passing through the right axle oil passage 111B lubricates the needle bearing 31B of the second planetary gear speed reducer 12B and the meshing portions of the gears 21B, 22B, and 24B.

As described above, according to the rear wheel drive device 1 of the present embodiment, the suction port 71b of the strainer 71 used for oil supply is disposed in the strainer accommodating chamber 105, and the suction port 71b The second electric motor 2A, 2B is disposed closer to the rotational axis X in the longitudinal direction of the vehicle than the first virtual vertical plane V1 in contact with the foremost end Df of the radially outermost edge D of the second electric motor 2A, 2B, and the second electric motor of the first electric motor 2A It arrange | positions between the 2nd virtual vertical plane V2 which passes a side edge part, and the 3rd virtual vertical plane V3 which passes the 1st motor side edge part of the 2nd electric motor 2B. Accordingly, the suction port 71b of the strainer 71 is disposed in the vicinity of the center in the front-rear direction of the vehicle drive device 1 having two electric motors 2A, 2B on the left and right, and in the vicinity of the center in the left-right direction, so that acceleration, deceleration, turning, etc. Thus, even if the liquid level changes in the front-rear and left-right directions, it is possible to suppress the suction port 71b from being exposed above the liquid level and to prevent the occurrence of aeration.
Further, the suction port 71b is disposed closer to the rotation axis X in the vehicle front-rear direction than the frontmost end Df of the radially outermost edge D of the first and second electric motors 2A, 2B. can do.

  The suction port 71b is disposed at a position that intersects the virtual intermediate plane P that is orthogonal to the rotation axis X direction and is equidistant from the first and second electric motors 2A and 2B. Thereby, since the suction port 71b is arranged closer to the center in the left-right direction, even if the liquid level changes in the left-right direction due to turning, it is possible to further suppress the suction port 71b from being exposed above the liquid level. And aeration can be further prevented.

  Further, the strainer accommodating chamber 105 is formed only on the frontmost end Df side of the radially outermost edge portion D of the first and second electric motors 2A, 2B in the front-rear direction where the suction port 71b is disposed with respect to the rotation axis X. Is done. Thereby, the bottom area of the strainer accommodating chamber 105 is limited in the front-rear direction, and the depth of the liquid fluid can be increased. Therefore, exposure of the suction port 71b is further suppressed, and generation of aeration can be further prevented. In addition, the space on the other side in the front-rear direction with respect to the rotation axis X in which the strainer accommodating chamber 105 is not formed can be effectively utilized by installing other members, and the degree of design freedom can be improved.

  Further, at least a part of the strainer accommodating chamber 105 is disposed between the foremost end Df and the rearmost end Dr of the radially outermost edge D of the first and second electric motors 2A, 2B in the front-rear direction. Thereby, at least a part of the strainer accommodating chamber 105 efficiently utilizes the space formed between the foremost end Df and the rearmost end Dr of the radially outermost edge D of the first and second electric motors 2A, 2B. can do. Further, the area where the strainer accommodating chamber 105 exists can be brought close to the rotation axis X, and the center of change of the liquid level during acceleration, deceleration, and turning can be brought close to the rotation axis X, thereby preventing the occurrence of aeration. it can.

  Further, the suction port 71b is disposed between the rotation axis X and the intermediate position 105c in the front-rear direction of the strainer storage chamber 105 in a top view. As a result, the suction port 71b is disposed on the side closer to the rotation axis X in the strainer accommodating chamber 105, so that the suction port 71b can be further suppressed from being exposed above the liquid level, and aeration is generated. Can be prevented more.

  Further, the suction port 71 b is positioned below the rotation axis X in the vertical direction and is disposed in the vicinity of the bottom wall 103 of the strainer accommodating chamber 105. Thereby, it is possible to further suppress the suction port 71b from being exposed above the liquid level, and to further prevent the occurrence of aeration.

  The suction port 71 b opens toward the bottom wall 103 of the strainer storage chamber 105. As a result, the suction port 71b is less likely to be exposed above the liquid level with respect to the liquid level that changes during travel, and aeration can be prevented.

  The first electric motor 2A and the first planetary gear type speed reducer 12A are arranged in this order from the outer side in the vehicle width direction, and the second electric motor 2B and the second planetary gear type speed reducer 12B are arranged from the outer side in the vehicle width direction. By arranging in this order, the first and second planetary gear type speed reducers 12A and 12B are arranged between the first and second electric motors 2A and 2B, and the radial direction of the first planetary gear type speed reducer 12A. The first and second electric motors 2A, 2B are provided such that at least a part of the outermost edge and the radially outermost edge of the second planetary gear type speed reducer 12B is provided with an offset space OS recessed in the radial direction around the outermost edge. It is formed smaller than the outermost edge D in the radial direction. Therefore, the vehicle drive device 1 can be reduced in size by effectively using the offset space OS.

  Further, since at least a part of the liquid suction channel 94 that communicates the electric oil pump 70 and the suction port 71b is disposed in the offset space OS, the suction port 71b can be brought closer to the rotation axis X in the front-rear direction. Therefore, it can suppress that the whole apparatus enlarges to radial direction.

  In addition, a strainer 71 that filters oil is disposed in the liquid suction path 94, and at least a part of the strainer 71 is disposed in the offset space OS. Therefore, the strainer 71 enlarges the entire apparatus in the radial direction. Can be suppressed.

  The suction port 71b is formed near the tip of the lower portion of the strainer 71 near the rotational axis X, and the surface of the upper portion 71c of the strainer 71 located immediately above the suction port 71b is the diameter of the first planetary gear type speed reducer 12A. The outermost edge is opposed to at least a part of the outermost edge in the radial direction and the radially outermost edge of the second planetary gear speed reducer 12B, and is inclined with respect to the vertical direction. Accordingly, the upper portion 71c of the strainer 71 does not interfere with the radially outermost edges of the first and second planetary gear type speed reducers 12A and 12B, and the suction port 71b provided in the strainer 71 is moved by the rotation axis X in the front-rear direction. It can approach, and generation | occurrence | production of aeration can be prevented more.

  In addition, a hydraulic brake 60 is connected to the second planetary gear speed reducer 12B, and the hydraulic brake 60 is disposed on the outer periphery of the radially outermost edge of the second planetary gear speed reducer 12B. Thereby, even if it has the hydraulic brake 60, it is provided around at least a part of the radial outermost edge of the first planetary gear speed reducer 12A and the radial outermost edge of the second planetary gear speed reducer 12B. By effectively using the offset space OS thus obtained, the vehicle drive device 1 can be reduced in size.

  In addition, at least a part of the strainer 71 that is provided in the liquid supply path 94 that communicates the electric oil pump 70 and the suction port 71b and performs oil filtration is disposed in the offset space OS, and the surface of the upper portion 71c of the strainer 71 is provided. Has a shape having two planes 71c1 and 71c2 that are bent at the vertex 71c3 as viewed in the front-rear direction, and the vertex 71c3 is biased toward the side where the hydraulic brake 60 is not disposed with respect to the center C in the left-right direction of the strainer 71. It is formed. As a result, the strainer 71 can be disposed by utilizing the offset space OS in which the hydraulic brake 60 is not disposed while avoiding the hydraulic brake 60, and the entire apparatus can be disposed in the diameter without being separated from the rotation axis X. An increase in size in the direction can be suppressed.

  In the vehicle drive device of the above embodiment, the first and second planetary gear type transmissions 12A and 12B are arranged between the first and second electric motors 2A and 2B. The second electric motors 2A and 2B may be arranged between the first and second planetary gear type transmissions 12A and 12B. Hereinafter, the structure which concerns on the modification of the drive device for vehicles is demonstrated with reference to the schematic diagram of FIG.13 and FIG.14.

  The vehicle drive device 1 according to the modification is provided on a power transmission path between a first electric motor 2A as a first driving source for driving the left rear wheel LWr of the vehicle, and the left rear wheel LWr and the first electric motor 2A. The first planetary gear speed reducer 12A as the first transmission, the first electric motor 2A, and the first planetary gear speed reducer 12A are accommodated for lubrication and / or cooling of the first planetary gear speed reducer 12A. A first case 11L having a left reservoir RL for storing the liquid fluid to be provided, a second motor 2B as a second drive source for driving the right rear wheel RWr of the vehicle, a right rear wheel RWr and a second motor 2B The second planetary gear type speed reducer 12B, the second electric motor 2B and the second planetary gear type speed reducer 12B, which are provided on the power transmission path, are accommodated to lubricate and / or lubricate the second planetary gear type speed reducer 12B. Or has a right reservoir RR for storing a liquid fluid to be cooled Comprising a second case 11R, a. The first and second planetary gear speed reducers 12A and 12B have the same diameter, and the rotation axes of the first and second planetary gear speed reducers 12A and 12B and the rotations of the first and second electric motors 2A and 2B. The axis line is arranged on the same line, the first planetary gear type reduction gear 12A and the first electric motor 2A are arranged in this order from the outside in the vehicle width direction, and the second planetary gear type reduction gear 12B and the second electric motor 2B Are arranged in this order from the outside in the vehicle width direction, whereby the first and second electric motors 2A, 2B are arranged between the first and second planetary gear type speed reducers 12A, 12B. Furthermore, between the left reservoir RL and the right reservoir RR, a strainer accommodating chamber 105 is disposed as a left and right communication path that connects the left reservoir RL and the right reservoir RR.

  And in this embodiment, the inlet 71b of the strainer 71 used for supply of a liquid fluid is arrange | positioned in the strainer accommodating chamber 105, and the inlet 71b is the 1st and 2nd planetary gear type reduction gears 12A and 12B. The second planetary gear speed reducer of the first planetary gear speed reducer 12A is disposed closer to the rotational axis X in the longitudinal direction of the vehicle than the first virtual vertical plane V1 ′ in contact with the foremost end of the radially outermost edge. It arrange | positions between 2nd virtual vertical plane V2 'which passes a side edge part, and 3rd virtual vertical plane V3' which passes the 1st transmission side edge part of 2nd planetary gear type reduction gear 12B.

  For this reason, in this modification, at least a part of the radial outermost edge of the first electric motor 2A and the radial outermost edge of the second electric motor 2B is the radial direction of the first and second planetary gear speed reducers 12A, 12B. An offset space OS that is smaller than the outermost edge and that is recessed in the radial direction is provided around the periphery.

The strainer accommodating chamber 105 is disposed between the foremost end Df ′ and the rearmost end Dr ′ of the radially outermost edge D ′ of the first and second planetary gear speed reducers 12A, 12B in the front-rear direction. The strainer accommodating chamber 105 has a suction port 71b with respect to the rotation axis X, and the foremost side of the radially outermost edge portion D ′ of the first and second planetary gear speed reducers 12A and 12B in the front-rear direction. Only formed.
In addition, the structure of the strainer 71 arrange | positioned in the strainer accommodation chamber 105 is substantially the same as that of the said embodiment.

Therefore, according to the rear-wheel drive device 1 according to this modification, the suction port 71b of the strainer 71 is disposed in the strainer accommodating chamber 105, and the suction port 71b is connected to the first and second planetary gear speed reducers 12A and 12B. The second planet of the first planetary gear type speed reducer 12A is disposed closer to the rotational axis X in the longitudinal direction of the vehicle than the first virtual vertical plane V1 ′ in contact with the foremost end Df ′ of the radially outermost edge D ′. Arranged between the second virtual vertical plane V2 'passing through the gear-type reduction gear side end and the third virtual vertical plane V3' passing through the first transmission-side end of the second planetary gear type reduction gear 12B. . Accordingly, the strainer 71 is disposed in the vicinity of the center in the front-rear direction of the rear wheel drive device 1 having the two electric motors 2A, 2B and the first and second planetary gear speed reducers 12A, 12B in the left-right direction and in the vicinity of the center in the left-right direction. Since the suction port 71b is arranged, it is possible to suppress the suction port 71b from being exposed above the liquid level even when the liquid level changes in the front-rear and left-right directions due to acceleration, deceleration, turning, etc., and aeration is generated. Can be prevented.
Further, the suction port 71b is disposed closer to the rotational axis X in the longitudinal direction of the vehicle than the foremost end Df ′ of the radially outermost edge portion D ′ of the first and second planetary gear speed reducers 12A and 12B. The drive device can be reduced in size.

  The suction port 71b is disposed at a position that intersects the virtual intermediate plane P that is orthogonal to the rotation axis X direction and is equidistant from the first and second electric motors 2A and 2B. Thereby, since the suction port 71b is arranged closer to the center in the left-right direction, even if the liquid level changes in the left-right direction due to turning, it is possible to further suppress the suction port 71b from being exposed above the liquid level. And aeration can be further prevented.

  The strainer accommodating chamber 105 is disposed between the foremost end Df ′ and the rearmost end Dr ′ of the radially outermost edge D ′ of the first and second planetary gear speed reducers 12A and 12B in the front-rear direction. Thereby, the strainer accommodating chamber 105 efficiently uses the space formed between the foremost end Df ′ and the rearmost end Dr ′ of the radially outermost edge D ′ of the first and second planetary gear type speed reducers 12A and 12B. Can be used. In addition, since the area where the strainer accommodating chamber 105 exists is limited, the liquid level can be kept high even with the same amount of liquid fluid, and the exposure of the suction port 71b is suppressed, thereby preventing aeration. More can be prevented.

  The strainer accommodating chamber 105 has a suction port 71b with respect to the rotation axis X, and the foremost end of the radially outermost edge portion D ′ of the first and second planetary gear speed reducers 12A and 12B in the front-rear direction. Since it is formed only on the Df ′ side, the bottom area of the strainer accommodating chamber 105 is limited in the front-rear direction, the oil depth can be increased, the exposure of the suction port 71b is further suppressed, and aeration is generated. Can be prevented more. In addition, the space on the other side in the front-rear direction with respect to the rotation axis X in which the strainer accommodating chamber 105 is not formed can be effectively utilized by installing other members, and the degree of design freedom can be improved.

  Further, the suction port 71b is disposed between the rotation axis X and the intermediate position 105c in the front-rear direction of the strainer storage chamber 105 in a top view. As a result, the suction port 71b is disposed on the side closer to the rotation axis X in the strainer accommodating chamber 105, so that the suction port 71b can be further suppressed from being exposed above the liquid level, and aeration is generated. Can be prevented more.

  The suction port 71b is positioned below the rotation axis X in the vertical direction, and is disposed near the bottom wall 103 of the strainer storage chamber. As a result, the suction port 71b is disposed near the bottom of the strainer accommodating chamber 105, so that the suction port 71b can be further prevented from being exposed above the liquid level, and the occurrence of aeration can be further prevented. it can.

  Further, the suction port 71b opens toward the bottom of the left and right communication path. As a result, the suction port 71b is less likely to be exposed above the liquid level with respect to the liquid level that changes during travel, and aeration can be prevented.

  Further, at least a part of the radially outermost edge of the first motor 2A and the radially outermost edge of the second motor 2B is formed smaller than the radially outermost edges of the first and second planetary gear speed reducers 12A and 12B. An offset space OS ′ that is recessed in the radial direction is provided around the periphery. Thereby, the drive device can be reduced in size by effectively using the offset space OS ′.

  Further, since at least a part of the liquid supply path 94 that communicates the electric oil pump 70 and the suction port 71b is disposed in the offset space OS ′, the suction port 71b can be brought closer to the rotation axis X in the front-rear direction. Therefore, it can suppress that the whole apparatus enlarges to radial direction.

  In addition, a strainer 71 that filters oil is disposed in the liquid supply path 94, and at least a part of the strainer 71 is disposed in the offset space OS ′, so that the entire apparatus is enlarged in the radial direction by the strainer 71. Can be suppressed.

  The suction port 71b is formed near the tip of the lower portion of the strainer 71 near the rotation axis X, and the surface of the upper portion 71c of the strainer 71 located immediately above the suction port 71b is the outermost radial edge of the first electric motor 2A. The second electric motor 2B is formed so as to be opposed to at least a part of each outer edge with the radially outermost edge and inclined with respect to the vertical direction. Thereby, the suction port 71b provided in the strainer 71 can be brought closer to the rotation axis X in the front-rear direction, and the generation of aeration can be further prevented.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
Further, the front wheel drive device 6 may use the electric motor 5 as a sole drive source without using the internal combustion engine 4.

  In the present embodiment, the left case 11A and the central case 11M constitute a first case 11L, and the right case 11B and the central case 11M constitute a second case 11R. However, as long as the first case 11L of the present invention accommodates the first electric motor 2A and the first planetary gear type speed reducer 12A and has the left reservoir RL, the second case 11R is the second electric motor. The structure is not limited to this as long as it accommodates 2B and the second planetary gear type speed reducer 12B and has the right reservoir RR.

  Furthermore, in the embodiment as shown in FIGS. 2 to 12, the first transmission is on the power transmission path between the left wheel and the first motor 2A, and the power transmission path between the right wheel and the second motor 2B is on. Although the second transmission is configured to be respectively disposed, the present invention may be configured to include the first and second electric motors 2A and 2B without including the first and second transmissions.

  In the present invention, oil is used as a liquid medium used for cooling and lubrication, but other liquids may be used.

  Further, in the embodiment shown in FIGS. 2 to 12, the suction port 71b and the strainer accommodating chamber 105 are arranged on the foremost end Df side of the radially outermost edge D of the first and second motors. And you may arrange | position at the rearmost end Dr side of the radial direction outermost edge part D of a 2nd electric motor. In this case, the suction port 71b is disposed closer to the rotation axis X in the vehicle front-rear direction than the first virtual vertical plane V1 in contact with the rearmost end Dr of the radially outermost edge D of the first and second motors 2A, 2B. The

  Similarly, in the modified examples as shown in FIGS. 13 and 14, the suction port 71 b and the strainer accommodating chamber 105 are arranged on the foremost end Df ′ side of the radially outermost edge D ′ of the first and second transmissions. However, it may be arranged on the rearmost end Dr ′ side of the radially outermost edge portion D ′ of the first and second transmissions. In this case, the suction port 71b is closer to the rotation axis X in the vehicle front-rear direction than the first virtual vertical plane V1 ′ in contact with the rearmost end Dr of the radially outermost edge portion D ′ of the first and second transmissions 12A and 12B. Placed in.

  Further, in the present embodiment, the suction port of the liquid fluid supply device of the present invention is the suction port 71b of the strainer 71 connected to the electric oil pump 70 which is a liquid fluid supply device. However, the present invention is not limited to this, and may be, for example, a liquid fluid passage extending from the electric oil pump 70.

1 Rear wheel drive system (vehicle drive system)
2A 1st electric motor (1st drive source)
2B Second electric motor (second drive source)
11 Case 11L First case 11R Second case 12A First planetary gear reducer (first transmission)
12B Second planetary gear type speed reducer (second transmission)
70 Electric oil pump (liquid medium supply device)
71 Strainer 71b Suction port 71c Upper part 71c1, 71c2 Flat surface 71c3 Top surface 105 Strainer accommodation chamber (left and right communication path)
105c Intermediate position in the front-rear direction of the strainer storage chamber (intermediate position in the front-rear direction of the left and right communication path)
C Strainer left and right center D, D 'radially outermost edge Df, Df' foremost end Dr, Dr 'last end LWr Left rear wheel (left wheel)
RWr Right rear wheel (right wheel)
P Virtual intermediate plane RL Left reservoir RR Right reservoir V1, V1 ′ First virtual vertical plane V2, V2 ′ Second virtual vertical plane V3, V3 ′ Third virtual vertical plane X Rotation axis

Claims (15)

A first electric motor for driving the left wheel of the vehicle;
A first case that houses the first motor and has a left reservoir that stores a liquid fluid used for lubrication and / or cooling of the first motor;
A second electric motor for driving the right wheel of the vehicle;
A second case that houses the second motor and has a right reservoir that stores liquid fluid that is used for lubrication and / or cooling of the second motor;
With
The first and second motors have the same diameter, the rotation axes of the first and second motors are arranged on the same line, and
Between the left reservoir and the right reservoir, there is a vehicle drive device in which a left and right communication passage that communicates the left reservoir and the right reservoir is disposed,
An inlet of the liquid fluid supply device used for supplying the liquid fluid is disposed in the left and right communication passages,
The suction port is disposed closer to the rotational axis in the front-rear direction of the vehicle than the first virtual vertical plane in contact with the foremost end or the rearmost end of the radially outermost edges of the first and second motors, and Arranged between a second virtual vertical plane passing through the second motor side end of the first motor and a third virtual vertical plane passing through the first motor side end of the second motor ;
The vehicle drive device according to claim 1, wherein the left and right communication passages in which the suction port is disposed are formed only on a side where the suction port is disposed in the front-rear direction with respect to the rotation axis . 2. The vehicle drive device according to claim 1, wherein the suction port is disposed between the rotation axis and an intermediate position in the front-rear direction of the left and right communication passages in a top view. A first transmission is disposed on a power transmission path between the left wheel and the first electric motor,
A second transmission is disposed on a power transmission path between the right wheel and the second electric motor,
The first electric motor and the first transmission are arranged in this order from the outer side in the vehicle width direction, and the second electric motor and the second transmission are arranged in this order from the outer side in the vehicle width direction. The first and second transmissions are disposed between the first and second electric motors;
At least a part of the radially outermost edge of the first transmission and the radially outermost edge of the second transmission is provided with an offset space recessed in the radial direction around the first and second edges. Formed smaller than the radially outermost edge of the motor ,
The liquid fluid supply device with at least a portion of the liquid fluid flow path communicating with said inlet port, vehicle drive device according to claim 1 or 2, characterized in that disposed in the offset space. The vehicle drive device according to claim 3 , wherein a strainer for filtering the liquid fluid is disposed in the liquid fluid flow path, and at least a part of the strainer is disposed in the offset space. . The suction port is formed near the tip of the lower portion of the strainer near the rotation axis,
The upper surface of the strainer located immediately above the suction port is opposed to at least a part of the first transmission and the second transmission and is inclined with respect to the vertical direction. The vehicle drive device according to claim 4 . A first transmission is disposed on a power transmission path between the left wheel and the first electric motor,
A second transmission is disposed on a power transmission path between the right wheel and the second electric motor,
The first electric motor and the first transmission are arranged in this order from the outer side in the vehicle width direction, and the second electric motor and the second transmission are arranged in this order from the outer side in the vehicle width direction. The first and second transmissions are disposed between the first and second electric motors;
At least a part of the radially outermost edge of the first transmission and the radially outermost edge of the second transmission is provided with an offset space recessed in the radial direction around the first and second edges. Formed smaller than the radially outermost edge of the motor,
A braking means is connected to one of the first transmission and the second transmission,
The braking means is disposed on the outer periphery of the radially outermost edge of the one transmission ,
At least a part of a strainer that is provided in a liquid fluid flow path that communicates the liquid fluid supply device and the suction port and performs filtration of the liquid fluid is disposed in the offset space,
The upper surface of the strainer has a shape having two planes that bend at the apex as viewed in the front-rear direction,
The vertex to the lateral center of the strainer, the vehicle drive device according to claim 1 or 2, characterized in that it is formed to deviate to the side where the brake means is not disposed. 7. The suction port according to claim 1, wherein the suction port is disposed at a position that is orthogonal to the rotational axis direction and intersects a virtual intermediate plane located at an equal distance from the first and second motors. The vehicle drive device according to claim 1. The suction port is positioned below the rotation axis in the vertical direction, and is disposed near the bottom of the left and right communication passages;
The vehicle drive device according to any one of claims 1 to 7, wherein the suction port is opened toward a bottom portion of the left and right communication passages. A first drive source for driving the left wheel of the vehicle;
A first transmission provided on a power transmission path between the left wheel and the first drive source;
A first case having a left reservoir that houses the first drive source and the first transmission and stores a liquid fluid used for lubrication and / or cooling of the first transmission;
A second drive source for driving the right wheel of the vehicle;
A second transmission provided on a power transmission path between the right wheel and the second drive source;
A second case having a right reservoir that houses the second drive source and the second transmission and stores a liquid fluid used for lubrication and / or cooling of the second transmission;
With
The first and second transmissions have the same diameter, the rotation axes of the first and second transmissions and the rotation axes of the first and second drive sources are arranged on the same line,
The first transmission and the first drive source are arranged in this order from the outside in the vehicle width direction, and the second transmission and the second drive source are arranged in this order from the outside in the vehicle width direction. Thus, the first and second drive sources are disposed between the first and second transmissions,
Between the left reservoir and the right reservoir, there is a vehicle drive device in which a left and right communication passage that communicates the left reservoir and the right reservoir is disposed,
An inlet of the liquid fluid supply device used for supplying the liquid fluid is disposed in the left and right communication passages,
The suction port is disposed closer to the rotational axis in the front-rear direction of the vehicle than the first virtual vertical plane in contact with the foremost end or the rearmost end of the radially outermost edges of the first and second transmissions, and It is arranged between a second virtual vertical plane passing through the second transmission side end of the first transmission and a third virtual vertical plane passing through the first transmission side end of the second transmission. ,
The vehicle drive device according to claim 1, wherein the left and right communication passages in which the suction port is disposed are formed only on a side where the suction port is disposed in the front-rear direction with respect to the rotation axis . 10. The vehicle drive device according to claim 9, wherein the suction port is disposed between the rotation axis and an intermediate position in the front-rear direction of the left and right communication passages in a top view. At least a part of the radially outermost edge of the first drive source and the radially outermost edge of the second drive source is provided with an offset space recessed in the radial direction around the first and second edges. Formed smaller than the radially outermost edge of the transmission ,
11. The vehicle drive device according to claim 9 , wherein at least a part of a liquid fluid flow path communicating with the liquid fluid supply device and the suction port is disposed in the offset space . The vehicle drive device according to claim 11 , wherein a strainer for filtering the liquid fluid is disposed in the liquid fluid flow path, and at least a part of the strainer is disposed in the offset space. . The suction port is formed near the tip of the lower portion of the strainer near the rotation axis,
The upper surface of the strainer located immediately above the suction port faces at least a part of each outer edge of the radially outermost edge of the first drive source and the radially outermost edge of the second drive source, and The vehicle drive device according to claim 12 , wherein the vehicle drive device is formed to be inclined with respect to a vertical direction. 14. The suction port according to claim 9, wherein the suction port is disposed at a position that is orthogonal to the rotational axis direction and intersects a virtual intermediate plane located at an equal distance from the first and second drive sources. The vehicle drive device according to claim 1. The suction port is positioned below the rotation axis in the vertical direction, and is disposed near the bottom of the left and right communication passages;
The vehicle drive device according to any one of claims 9 to 14, wherein the suction port is opened toward a bottom portion of the left and right communication passages.

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