JP5771663B2 - Vehicle drive device - Google Patents

Description

  The present invention relates to a vehicle drive device, and more particularly to a vehicle drive device that performs at least one of motor cooling, lubrication, transmission cooling, and lubrication.

  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. This mechanical oil pump forms a pump chamber in which a rotating body is accommodated by a partition wall and a pump cover of a case, and rotates by driving an electric motor.

JP-A-6-098417

  By the way, in the electric vehicle described in Patent Document 1, since the oil from the mechanical oil pump is directly supplied to the oil passage in the drive shaft, it is necessary to take measures such as providing a separate oil cooler due to insufficient heat dissipation of the oil. Met. Moreover, about an electric oil pump, the specific arrangement | positioning is not described and the oil cooled using the cooler is supplied to the motor for driving | running | working. Further, since the pump chamber of the mechanical oil pump is composed of the case partition wall and the pump cover, there is room for improvement in pump assembly workability.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle drive device capable of improving assembly workability and shortening assembly work time in a configuration including a liquid medium supply device. And

In order to achieve the above object, the invention described in claim 1
An electric motor (for example, electric motors 2A and 2B in an embodiment described later) connected to a vehicle wheel (for example, a left rear wheel LWr, a right rear wheel RWr in an embodiment described later);
To be cooled parts to be cooled (for example, cooled parts A1 and B1 in the embodiments described later) and lubricated parts (for example, lubricated parts A2 and B2 in the embodiments described later) of the electric motor A liquid medium supply device for supplying a liquid medium (for example, an electric oil pump 70 according to an embodiment described later);
A case for housing the electric motor (for example, a case 11 in an embodiment described later);
A separate member that is detachably provided on the case (for example, a lid member 72 in an embodiment described later);
With
The case includes an opening that opens toward the outside (for example, a front opening 105a in an embodiment described later),
A separate member fixing portion (for example, a lid member fixing portion 105b in an embodiment described later) formed on the case and a case fixing portion (for example, a case fixing portion 72a in an embodiment described later) formed on the separate member. ) Is a vehicle driving device (for example, a rear wheel driving device 1 according to an embodiment described later) in which the opening of the case is closed by the separate member,
In the liquid medium flow path through which the liquid medium flows, a hydraulic drive valve (for example, a low-pressure oil path switching valve 73, a brake oil path switching valve 74, a relief valve 84 in an embodiment described later) and an electric drive valve (for example, described later). The solenoid valve 83) of the embodiment of
In the attached state, the hydraulically driven valve is fixed to the inside of the separate member, while the electrically driven valve is attached to the outside of the separate member.

The invention according to claim 2
A transmission (for example, a planetary gear type speed reducer 12A according to an embodiment described later) disposed on a power transmission path between a vehicle wheel (for example, a left rear wheel LWr and a right rear wheel RWr according to an embodiment described later) and a power source. 12B)
A liquid medium supply device (for example, described later) that supplies a liquid medium to a cooled portion that is at least one of a cooled portion and a lubricated portion (for example, lubricated portions A3 and B3 in the embodiments described later) of the transmission. Electric oil pump 70) of the embodiment;
A case for accommodating the transmission (for example, a case 11 in an embodiment described later);
A separate member that is detachably provided on the case (for example, a lid member 72 in an embodiment described later);
With
The case includes an opening that opens toward the outside (for example, a front opening 105a in an embodiment described later),
A separate member fixing portion (for example, a lid member fixing portion 105b in an embodiment described later) formed on the case and a case fixing portion (for example, a case fixing portion 72a in an embodiment described later) formed on the separate member. ) Is a vehicle driving device (for example, a rear wheel driving device 1 according to an embodiment described later) in which the opening of the case is closed by the separate member,
In the liquid medium flow path through which the liquid medium flows, a hydraulic drive valve (for example, a low-pressure oil path switching valve 73, a brake oil path switching valve 74, a relief valve 84 in an embodiment described later) and an electric drive valve (for example, described later). The solenoid valve 83) of the embodiment of
In the attached state, the hydraulically driven valve is fixed to the inside of the separate member, while the electrically driven valve is attached to the outside of the separate member.

The invention according to claim 3
A hydraulic connecting / disconnecting means (for example, a power transmission path) that is disposed on a power transmission path between a vehicle wheel (for example, a left rear wheel LWr and a right rear wheel RWr in an embodiment described later) and a power source, A hydraulic brake 60) of an embodiment described later;
A liquid medium supply device (for example, an electric oil pump 70 according to an embodiment described later) for supplying a liquid medium to a hydraulic chamber (for example, a working chamber S according to an embodiment described later) of the hydraulic disconnection means;
A case (for example, a case 11 in an embodiment described later) that accommodates the hydraulic connection / disconnection means;
A separate member that is detachably provided on the case (for example, a lid member 72 in an embodiment described later);
With
The case includes an opening that opens toward the outside (for example, a front opening 105a in an embodiment described later),
A separate member fixing portion (for example, a lid member fixing portion 105b in an embodiment described later) formed on the case and a case fixing portion (for example, a case fixing portion 72a in an embodiment described later) formed on the separate member. ) Is a vehicle driving device (for example, a rear wheel driving device 1 according to an embodiment described later) in which the opening of the case is closed by the separate member,
In the liquid medium flow path through which the liquid medium flows, a hydraulic drive valve (for example, a low-pressure oil path switching valve 73, a brake oil path switching valve 74, a relief valve 84 in an embodiment described later) and an electric drive valve (for example, described later). The solenoid valve 83) of the embodiment of
In the attached state, the hydraulically driven valve is fixed to the inside of the separate member, while the electrically driven valve is attached to the outside of the separate member.

Moreover, in addition to the structure of any one of Claims 1-3, invention of Claim 4 is provided.
The liquid medium supply device is attached to the outside of the separate member in the attached state.

Moreover, in addition to the structure of Claim 4, the invention of Claim 5 adds to the structure of Claim 4,
The case has a storage part for storing the liquid medium (for example, a strainer storage chamber 105 of an embodiment described later),
A suction-side flow path (for example, an oil suction path 94 in an embodiment described later) that communicates the reservoir and the liquid medium supply device is detachably fixed to the separate member and the separate member. A separate member (for example, a strainer 71 of the embodiment described later),
The other separate member is fixed only to the separate member.

Moreover, in addition to the structure of Claim 5, the invention of Claim 6 is
A filtration member (for example, a strainer 71 in an embodiment described later) for filtering the liquid medium is disposed in the suction side flow path.

Moreover, in addition to the structure of any one of Claims 1-3, invention of Claim 7 is provided,
The case has a storage part for storing the liquid medium (for example, a strainer storage chamber 105 of an embodiment described later),
At least a part of the opening is formed at a position overlapping the reservoir,
In the attached state, the separate member constitutes a wall surface of the storage portion.

According to the first aspect of the present invention, in the vehicle drive device provided with the electric motor, both the hydraulic drive valve and the electric drive valve are fixed or attached to separate members of the case. The drive valve and the separate member can be handled in an integrated manner, so that the assembly workability is improved and the assembly work time can be shortened .

According to the invention described in claim 2, in the vehicle drive device provided with the transmission, both the hydraulic drive valve and the electric drive valve are fixed to or attached to separate members of the case. It becomes possible to handle the electrically driven valve and the separate member integrally, improving the assembly workability and shortening the assembly work time .

According to the third aspect of the present invention, in the vehicle drive device provided with the hydraulic connection / disconnection means, both the hydraulic drive valve and the electric drive valve are fixed or attached to separate members of the case. The drive valve, the electric drive valve, and the separate member can be handled in an integrated manner, so that the assembling workability can be improved and the assembling work time can be shortened .

  According to the fourth aspect of the invention, in addition to the hydraulically driven valve, the electrically driven valve, and the separate member, the liquid medium supply device can be handled integrally, and the assembly workability of the liquid medium supply device is improved. , Assembly time can be shortened.

  According to the fifth aspect of the present invention, attachment / detachment to / from the case of the separate member forming the suction-side flow path is handled simultaneously with the attachment / detachment of the separate member. be able to. In addition, since the other separate member can be attached to and detached from the separate member, maintenance and replacement of the suction side flow path can be easily performed.

  According to the sixth aspect of the present invention, the filtering member can be handled integrally with the separate member, the maintenance and replacement of the filtering member can be easily performed, and a space for arranging the filtering member is separately provided. There is no need to secure.

  According to the seventh aspect of the present invention, the separate member on which the liquid medium supply device is arranged and the storage portion can be arranged close to each other, and the suction side flow path length of the liquid medium supply device can be shortened. it can. Moreover, in a state where the separate member is removed, a part of the wall surface of the storage part is removed, so that the inside of the storage part can be easily seen, and the storage part can be easily cleaned.

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. FIG. 10 is a longitudinal sectional view of the rear wheel drive device according to the embodiment, taken along line II-II shown in FIG. 9. 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. (A) is the perspective view which looked at the lid member to which the electric oil pump was attached from the inside, (b) is the front view which looked at the lid member from the inside. It is sectional drawing of the electric oil pump which followed the VII-VII line of FIG. It is a front view of the rear-wheel drive device which shows the flow of oil typically. It is a side view of the rear-wheel drive device which shows the flow of oil typically. It is a principal part expanded sectional view of the rear-wheel drive device which shows the flow of oil typically. FIG. 3 is a hydraulic circuit diagram for cooling and / or lubricating the electric motor of the rear wheel drive device and lubricating the transmission.

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. While power is transmitted to the front wheel Wf via the transmission 7, 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 and 2B of the rear wheel drive device 1 on the rear wheel Wr side are connected to the battery 9 to supply power from the battery 9 and to regenerate energy to the battery 9. Is possible. 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 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 central 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 central case 11M constitute a second case 11R that accommodates the second electric motor 2B and the second planetary gear 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. 2-10 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 outside of the case 11 so that the air inside the case 11 escapes to the outside through the breather chamber 41 so that the air does not become excessively high temperature and pressure. Configured as follows. 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, 44 and the left and right dividing walls 45 that form the lower surface of the breather chamber 41 are such that the first cylindrical wall 43 is positioned radially inward from the second cylindrical wall 44, and the left and right dividing walls 45 are A third cylinder that extends from the inner end of the second cylindrical wall 44 to the inner end of the first cylindrical wall 43 while being bent while reducing the diameter, and further extends radially inward and extends substantially horizontally. Reach wall 46. The third cylindrical wall 46 is located on the inner side of both outer end portions of the first cylindrical wall 43 and the second cylindrical wall 44 and substantially in the center thereof.

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 radius, and 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.

  The first and second planetary gear speed reducers 12A and 12B include sun gears 21A and 21B, a plurality of planetary gears 22A and 22B meshed with the sun gear 21, and planetary carriers 23A that support these planetary gears 22A and 22B. , 23B and ring gears 24A, 24B meshed with the outer peripheral sides of the planetary gears 22A, 22B. The driving forces of the electric motors 2A, 2B are input from the sun gears 21A, 21B, and the decelerated driving forces are transmitted to the planetary carrier 23A, It is output to the axles 10A and 10B through 23B.

  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, and the planetary carriers 23A and 23B have an axially inner end extending radially inward to the axle 10A. 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, a hydraulic brake 60 constituting braking means for the ring gear 24B is provided. It arrange | positions so that it may overlap with the 1st pinion 26B in radial direction, and it may overlap with the 2nd pinion 27B in an 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. These plates 35 and 36 are arranged to be 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 further provided with a receiving provided on the outer peripheral surface of the third cylindrical wall 46. The elastic member 39 supported by the seat 38 is constantly urged in a direction to release the fixed plate 35 and the rotating plate 36.

  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.

  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 and 44 and the left and right dividing walls 45, a pair of projecting portions 101 and 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 rectangular tube 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 reservoir for accommodating a strainer 71 described later and storing oil. The tip surfaces of the pair of overhanging portions 101, 102, the bottom wall 103, and the upper wall 104 constituting the strainer accommodating chamber 105 form a lid member fixing portion 105b, and are the outer edges of the front opening portion 105a that opens outward. Form. Below the strainer accommodating chamber 105 is a reservoir for storing oil so that the lower ends of the rotors 15A and 15B of the electric motors 2A and 2B are not soaked in oil, and the front opening 105a The strainer storage chamber 105 is formed at a position overlapping the storage section. The front opening 105 a of the strainer accommodating chamber 105 is closed by a lid member 72 that is a separate member to which the electric oil pump 70 is attached. The lid member 72 is provided with a case fixing portion 72 a having a substantially square end surface at a position facing the lid member fixing portion 105 b of the case 11. As shown in FIGS. 5 and 6, the electric oil pump 70 includes a plurality of case fixing portions 72 a formed in the lid member 72 and a plurality of lid member fixing portions 105 b formed in the front opening 105 a of the strainer accommodating chamber 105. The bolt 106 is fastened and fixed to the front opening 105 a of the strainer accommodating chamber 105.

  Therefore, as shown in FIG. 5, the electric oil pump 70 attached to the case 11 is orthogonal to the axial direction of the first and second electric motors 2A and 2B, and is equidistant from the first and second electric motors 2A and 2B. It is arranged at a position that intersects the virtual plane P that is positioned. The electric oil pump 70 has the same center as the first and second planetary gear speed reducers 12A and 12B with respect to the first and second electric motors 2A and 2B in the axial direction of the first and second electric motors 2A and 2B. It is arranged on the side (one side). Furthermore, the electric oil pump 70 overlaps with the first and second cylindrical walls 43 and 44 in the axial direction of the first and second electric motors 2A and 2B. Therefore, the electric oil pump 70 and the first and second electric oil pumps 70 are overlapped with each other. At least a part of the planetary gear speed reducers 12A, 12B (in this embodiment, ring gears 24A, 24B and second pinions 27A, 27B) overlap in the axial direction of the first and second electric motors 2A, 2B.

  The pair of overhanging portions 101 and 102 forming the strainer accommodating chamber 105 include through holes 107a and 107b as left middle communication passages that connect the left reservoir RL and the strainer accommodating chamber 105, and the right reservoir RR and the strainer accommodating. A through hole (not shown) is formed as a right middle communication passage communicating with the chamber 105. Thereby, the left reservoir RL and the right reservoir RR communicate with each other via the strainer storage chamber 105.

  As shown in FIGS. 6, 7 and 9, 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 of a high pressure mode and a low pressure mode. It can be operated in one mode and is controlled by PID control. Then, while adjusting the discharge amount by rotating an unillustrated inner rotor or outer rotor provided in the suction portion 93, the oil flowed from the strainer 71 into the oil suction passage 94 provided in the electric oil pump 70 and the lid member 72. Oil is discharged to an oil discharge path 95 provided in the electric oil pump 70 and the lid member 72.

  The electric oil pump 70 is attached to the lid member 72 so as to be positioned in front of the lid member 72 when the lid member 72 is fixed to the case 11. An oil passage forming cover 96 that defines a part of an oil passage of a hydraulic circuit 99 to be described later is fixed by 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, which will be described later, are arranged in order from the bottom as hydraulic drive valves. As shown in FIG. 9, a solenoid valve 83 as an electric drive valve is attached to the side of the lid member 72 opposite to the oil passage forming cover 96, and the low pressure oil passage switching valve 73 and the brake oil passage are energized. A pilot oil passage 81 (described later) provided between the switch valve 74 and the switching valve 74 is communicated / blocked.

Further, the strainer 71 is detachably fixed only to the lid member 72 by having the discharge port 71a inserted into the lid member 72 and being fastened together with a bolt 69 that fastens the oil passage forming cover 96 to the lid member 72. ing. The strainer 71 removes foreign matter from the oil sucked from a suction port (not shown) 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.
The strainer 71, which is another separate member constituting the oil suction path 94 together with the electric oil pump 70 and the lid member 72, extends to the case side from the case fixing portion 72 a of the lid member 72, and the suction port of the strainer 71 Is located in the storage portion of the strainer accommodating chamber 105 in the attached state where the lid member 72 is fixed to the case 11.
Furthermore, as shown in FIG. 6B, in the front-rear direction, the strainer 71 is formed so as to fit within the outer edge parallel projection of the case fixing portion 72a of the lid member 72.

  The oil passage forming cover 96 has a working chamber port 108a of a brake oil passage 77, which will be described later, formed on the outer peripheral surface of the central case 11M in the strainer accommodating chamber 105, and cooling fluid passages 120A, 121A, which will be described later. Two outlet pipes 97a and 97b connected to the cooling / lubricating ports 108b of 120B and 121B and the lubricating flow paths 122A and 122B, respectively, 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. At the same time, the front opening 105 a formed at a position overlapping the storage portion of the strainer accommodating chamber 105 is closed by the lid member 72, and the inner wall surface of the lid member 72 including the oil passage forming cover 96 is connected to the strainer accommodating chamber 105. Configure the wall.
Therefore, the connecting portion between the outlet pipe 97a and the working chamber port 108a constitutes a connecting portion between the oil discharge passage 95 and the brake oil passage 77 to the working chamber S, and the outlet pipe 97b and the cooling / lubricating port 108b are connected to each other. The connecting portion constitutes a connecting portion between the oil discharge passage 95 and first cooling channel 120A, 121A (or second cooling channel 120B, 121B, lubrication channel 122A, 122B) described later.

  Further, the connecting portion between the outlet pipe 97a and the working chamber port 108a and the connecting portion between the outlet pipe 97b and the cooling / lubricating port 108b are attached more than the lid member fixing portion 105b which is the outer edge of the front opening 105a. In the direction, it is provided at a position separated from the inside of the case 11, and a separation space D (see FIG. 9) is formed between the connection portion and the lid member fixing portion 105b. In the separated space D, a low-pressure oil passage switching valve 73, a brake oil passage switching valve 74, and a relief valve 84 are disposed.

  In addition, a brake oil passage 77 (see FIG. 11) that communicates from the working chamber port 108a to the working chamber S is formed in the case 11, and the vertical direction extends from the cooling / lubricating port 108b to the front of the central case 11M. The front vertical oil passage 109 extending to the right and the front vertical oil passage 109 are branched to the left and right, and are formed by the outer wall surfaces 11A1, 11B1, and 11M1 facing the vehicle front of the cases 11A, 11B, and 11M, and the cases 11A, 11B, and 11M. The front horizontal oil passages 110A and 110B extending in the horizontal direction forward and the front and rear horizontal oil passages 111A and 111B extending rearward from the outer ends of the front horizontal oil passages 110A and 110B of the cases 11A and 11B are formed. Is done. A plurality of discharge ports 112A and 112B for supplying oil to the cooled portions A1 and B1 of the first and second electric motors 2A and 2B, that is, the coil side surfaces of the stators 14A and 14B, are provided in the front-rear horizontal oil passages 111A and 111B. Is formed (see FIGS. 2 and 10), and oil passages 113A and 113B for lubrication (see FIGS. 2 and 9) are connected to extend downward to supply oil into the axles 10A and 10B. ing.

  As shown in FIGS. 2 and 10, the front-rear horizontal oil passage 111A and the lubricating oil passage 113A communicating with the front horizontal oil passage 110A extending to the left are on the opposite side of the first motor 2A from the second motor 2B. It is located on the outer side in the axial direction than the one end E1 which is the end. Further, the front-rear horizontal oil passage 111B and the lubricating oil passage 113B communicating with the front horizontal oil passage 110B extending to the right are from the other end E2 that is the end of the second electric motor 2B opposite to the first electric motor 2A. Is also located outside in the axial direction.

  The axles 10A, 10B are formed with axial holes 114A, 114B extending along the axial direction of the first and second electric motors 2A, 2B, and in the axial direction with the lubricating oil passages 113A, 113B. The oil passages provided in the planetary carriers 23A and 23B are located at positions where the first radial holes 115A and 115B communicating with the lubricating oil passages 113A and 113B overlap with the planetary carriers 23A and 23B in the axial direction. Second radial holes 117 </ b> A and 117 </ b> B communicating with 116 are formed.

  For this reason, the electric oil pump 70 is connected to the first hole 2A in communication with the axial hole 114A on the outer side (the other side opposite to the first planetary gear type reduction gear 12A) with respect to the first electric motor 2A. A portion to be lubricated A3 of the machine 12A (for example, a meshing portion of the needle bearing 31A and the gears 21A, 22A, 23A, and 24A) is connected to the first electric motor 2A in communication with the axial hole 114A on the center side. The electric oil pump 70 is connected to the second electric motor 2B in communication with the axial hole 114B on the outer side (the other side opposite to the second planetary gear speed reducer 12B), and is connected to the second planetary gear speed reducer. 12B to be lubricated B3 (for example, the meshing portions of the needle bearing 31B and the gears 21B, 22B, 23B, and 24B) is connected to the second electric motor 2B in communication with the axial hole 114B on the center side.

  Accordingly, the front vertical oil passage 109, the left front horizontal oil passage 110A, the front-rear horizontal oil passage 111A, and the discharge port 112A provided in the case 11 are the first cooling flow that cools the coils of the stator 14A of the first electric motor 2A. A path 120A is configured. Further, the front vertical oil passage 109, the left front horizontal oil passage 110A, the front-rear horizontal oil passage 111A, and the lubricating oil passage 113A provided in the case 11 are a lubricated portion A2 (for example, a bearing 19A) of the first electric motor 2A. The first electric motor lubrication flow path 121A is configured to lubricate the motor. Further, the in-case lubricating flow path provided in the case 11, that is, the front vertical oil path 109, the left front horizontal oil path 110A, the front-rear horizontal oil path 111A, the lubricating oil path 113A, and the axle 10A provided in the axle 10A. The first radial hole 115A, the axial hole 114A, and the second radial hole 117A constitute a lubrication channel 122A for the first planetary gear speed reducer that lubricates the lubricated portion A3 of the first planetary gear speed reducer 12A. .

  Further, the front vertical oil passage 109, the right front horizontal oil passage 110B, the front-rear horizontal oil passage 111B, and the discharge port 112B provided in the case 11 are a second cooling flow for cooling the coil of the stator 14B of the second electric motor 2B. A path 120B is configured. Further, the front vertical oil passage 109, the right front horizontal oil passage 110B, the front-rear horizontal oil passage 111B, and the lubricating oil passage 113B provided in the case 11 are a lubricated portion B2 (for example, a bearing 19B) of the first electric motor 2A. A lubricating passage 121B for the second motor that lubricates the motor is configured. Further, the in-case lubrication flow path provided in the case 11, that is, the front vertical oil path 109, the right front horizontal oil path 110B, the front-rear horizontal oil path 111B, the lubrication oil path 113B, and the axle 10B is provided in the first. The first radial hole 115B, the axial hole 114B, and the second radial hole 117B constitute a lubrication channel 122B for the second planetary gear speed reducer that lubricates the lubricated portion B3 of the second planetary gear speed reducer 12B. .

  Therefore, the first cooling flow path 120A and the first motor lubrication flow path 121A allow the oil discharged from the electric oil pump 70 to pass through the outside of the one end E1 of the first electric motor 2A. The second cooling flow path 120B and the second motor lubrication flow path 121B are formed so that oil discharged from the electric oil pump 70 is formed so as to cool the cooled part A1 of 2A and lubrication of the lubricated part A2. The second motor 2B is formed so as to cool the portion to be cooled B1 and lubricate the portion to be lubricated B2 via the outside of the other end E2 of the second motor 2B. In the following description, the first motor cooling channel 120A and the first motor lubricating channel 121A are also referred to as “first cooling channel 120A, 121A”, and the second motor cooling channel 120B and The second motor lubrication channel 121B is also referred to as “second cooling channel 120B, 121B”.

  Further, the first planetary gear type reduction gear lubrication flow path 122A allows the oil discharged from the electric oil pump 70 to pass through the in-case lubrication flow path from the substantially central portion of the case 11 to the first electric motor 2A. Thus, the portion to be lubricated A3 of the transmission 12A is lubricated via the outer side opposite to the first planetary gear speed reducer 12A. The second planetary gear speed reducer lubrication flow path 122B is configured such that the oil discharged from the electric oil pump 70 passes through the in-case lubrication flow path from a substantially central portion of the case 11 and is second to the second electric motor 2B. The portion to be lubricated B3 of the transmission 12B is lubricated via the outer side opposite to the two planetary gear speed reducer 12B.

  Further, the oil flowing out from the opening ends 118A and 118B of the axial holes 114A and 114B is transmitted through the through holes 119A and 119B formed in the planetary carriers 23A and 23B, the small diameter portions of the ring gears 24A and 24B, and the ring gears 24A and 24B. Each part of the one-way clutch 50 is lubricated through a gap g formed between 29A and 29B.

  Next, a hydraulic circuit 99 that performs cooling and / or lubrication of the electric motors 2A and 2B and lubrication of the transmissions 12A and 12B will be described with reference to FIG.

  The hydraulic circuit 99 sucks oil from the strainer 71 disposed in the strainer accommodating chamber 105 and discharges oil discharged from the electric oil pump 70 through the low-pressure oil path switching valve 73 and the brake oil path switching valve 74. The working chamber S is configured to be able to supply oil, and via the low-pressure oil passage switching valve 73, the cooled parts A1 and B1, the lubricated parts A2 and B2, and the planetary gear speed reducers 12A and 12B of the electric motors 2A and 2B. The parts to be lubricated A3 and B3 (hereinafter also referred to as “lubricated / cooled parts A1 to B3”) can be supplied. The hydraulic circuit 99 is provided with a sensor 92 (see FIGS. 5 and 6) that detects the hydraulic pressure, temperature, and the like of the brake oil passage 77.

  The low-pressure oil passage switching valve 73 includes a first line oil passage 75a on the electric oil pump 70 side constituting the line oil passage 75 and a second line oil passage 75b on the brake oil passage switching valve 74 side constituting the line oil passage 75. And a first low-pressure oil passage 76a that communicates with the lubricated / cooled portions A1 to B3 and a second low-pressure oil passage 76b that communicates with the lubricated / cooled portions A1 to B3. Further, the low-pressure oil passage switching valve 73 allows the first line oil passage 75a and the second line oil passage 75b to always communicate with each other and the line oil passage 75 is selectively used as the first low-pressure oil passage 76a or the second low-pressure oil passage 76b. A valve body 73a that communicates with the valve body 73a, a spring 73b that urges the valve body 73a in a direction that communicates the line oil passage 75 and the first low-pressure oil passage 76a (rightward in FIG. 11), and a valve body 73a that communicates with the line oil passage. And an oil chamber 73c that presses the line oil passage 75 and the second low-pressure oil passage 76b in a direction (leftward in FIG. 11) with the oil pressure of 75. Therefore, the valve element 73a is urged by the spring 73b in a direction (rightward in FIG. 11) that connects the line oil passage 75 and the first low-pressure oil passage 76a, and is input to the oil chamber 73c at the right end in the drawing. The oil pressure of the line oil passage 75 is pressed in a direction (leftward in FIG. 11) that connects the line oil passage 75 and the second low-pressure oil passage 76b.

  Here, the urging force of the spring 73b is such that the valve body 73a does not move and the line oil passage 75 is secondly moved by the oil pressure of the line oil passage 75 input to the oil chamber 73c while the electric oil pump 70 is operating in the low pressure mode. It is set so as to be disconnected from the low-pressure oil passage 76b and communicated with the first low-pressure oil passage 76a (hereinafter, the position of the valve body 73a is referred to as a low-pressure side position). The hydraulic pressure of the line oil passage 75 that is input to the chamber 73c is set so that the valve body 73a moves to block the line oil passage 75 from the first low-pressure oil passage 76a and to communicate with the second low-pressure oil passage 76b. (Hereinafter, the position of the valve body 73a is referred to as a high-pressure side position).

  The brake oil passage switching valve 74 is connected to the second line oil passage 75 b constituting the line oil passage 75, the brake oil passage 77 connected to the hydraulic brake 60, and the storage portion 79 via the high position drain 78. Is done. Further, the brake oil passage switching valve 74 connects and disconnects the second line oil passage 75b and the brake oil passage 77, and shuts off the valve body 74a from the second line oil passage 75b and the brake oil passage 77. Spring 74b urging in the direction (rightward in FIG. 11), and the direction in which the valve body 74a communicates with the second line oil passage 75b and the brake oil passage 77 by the oil pressure of the line oil passage 75 (leftward in FIG. 11). And an oil chamber 74c that presses the Accordingly, the valve body 74a is urged by the spring 74b in a direction (rightward in FIG. 11) that blocks the second line oil passage 75b and the brake oil passage 77, and is input to the oil chamber 74c. The hydraulic pressure of 75 allows the second line oil passage 75b and the brake oil passage 77 to be pressed in a direction (leftward in FIG. 11).

  The urging force of the spring 74b moves the valve element 74a from the valve closing position to the valve opening position by the oil pressure of the line oil passage 75 input to the oil chamber 74c while the electric oil pump 70 is operating in the low pressure mode and the high pressure mode. Thus, the brake oil passage 77 is set so as to be disconnected from the high position drain 78 and communicated with the second line oil passage 75b. That is, regardless of whether the electric oil pump 70 is operated in the low pressure mode or the high pressure mode, the oil pressure of the line oil passage 75 input to the oil chamber 74c exceeds the urging force of the spring 74b, and the brake oil passage 77 is increased. Shut off from the position drain 78 and communicate with the second line oil passage 75b.

  In a state where the second line oil passage 75 b and the brake oil passage 77 are shut off, the hydraulic brake 60 is communicated with the storage portion 79 via the brake oil passage 77 and the high position drain 78. Here, the storage unit 79 is higher in the vertical direction than the strainer accommodating chamber 105, and more preferably, the vertical uppermost part of the storage unit 79 is the uppermost vertical direction and the uppermost vertical direction of the working chamber S of the hydraulic brake 60. It arrange | positions so that it may become a position higher in the vertical direction than the middle dividing point with a lower part. Accordingly, when the brake oil passage switching valve 74 is closed, the oil stored in the working chamber S of the hydraulic brake 60 is not directly discharged into the strainer storage chamber 105 but is discharged into the storage unit 79 and stored. Configured. The oil overflowing from the storage unit 79 is configured to be discharged to the strainer storage chamber 105. In addition, the storage portion side end portion 78 a of the high position drain 78 is connected to the bottom surface of the storage portion 79.

  The oil chamber 74 c of the brake oil passage switching valve 74 is connectable to a second line oil passage 75 b constituting the line oil passage 75 via a pilot oil passage 81 and a solenoid valve 83. The solenoid valve 83 is constituted by an electromagnetic three-way valve controlled by an ECU (not shown), and connects the second line oil passage 75b to the pilot oil passage 81 when the solenoid valve 83 is not energized by the ECU. The hydraulic pressure of the line oil passage 75 is input to 74c.

  In addition, when the solenoid valve 83 is energized, the oil stored in the oil chamber 74c is discharged to the strainer accommodating chamber 105 via the discharge oil passage 83a, and the second line oil passage 75b and the pilot oil passage 81 are connected to each other. Blocked.

  Further, in the hydraulic circuit 99, the first low-pressure oil passage 76a and the second low-pressure oil passage 76b merge on the downstream side to form a common low-pressure common oil passage 76c, and the low-pressure common oil passage 76c is formed at the junction. A relief valve 84 is connected to discharge the oil in the low-pressure common oil passage 76c to the reservoir 79 through the relief drain 86 and reduce the hydraulic pressure when the line pressure becomes equal to or higher than a predetermined pressure. The oil storage part side end 86 a of the relief drain 86 is disposed at a position higher than the vertical uppermost part of the storage part 79.

  Here, orifices 85a and 85b as flow path resistance means are formed in the first low pressure oil passage 76a and the second low pressure oil passage 76b, respectively, and the orifice 85a of the first low pressure oil passage 76a is the second low pressure oil passage 76a. The passage 76b is configured to have a larger diameter than the orifice 85b. Therefore, the flow resistance of the second low pressure oil passage 76b is larger than the flow resistance of the first low pressure oil passage 76a, and the amount of pressure reduction in the second low pressure oil passage 76b when the electric oil pump 70 is operating in the high pressure mode is The pressure reduction amount in the first low-pressure oil passage 76a during operation of the electric oil pump 70 in the low-pressure mode is greater, and the oil pressure in the low-pressure common oil passage 76c in the high-pressure mode and the low-pressure mode is substantially equal.

  Thus, the low-pressure oil passage switching valve 73 connected to the first low-pressure oil passage 76a and the second low-pressure oil passage 76b is more than the oil pressure in the oil chamber 73c when the electric oil pump 70 is operating in the low-pressure mode. The urging force of the spring 73b wins, and the urging force of the spring 73b causes the valve body 73a to be positioned at the low pressure side position, blocking the line oil passage 75 from the second low pressure oil passage 76b and communicating with the first low pressure oil passage 76a. The oil flowing through the first low-pressure oil passage 76a is reduced in pressure by the passage resistance at the orifice 85a, and reaches the lubricated / cooled portions A1 to B3 via the low-pressure common oil passage 76c. On the other hand, when the electric oil pump 70 is operating in the high pressure mode, the oil pressure in the oil chamber 73c is greater than the urging force of the spring 73b, and the valve element 73a is positioned at the high pressure side position against the urging force of the spring 73b. The line oil passage 75 is cut off from the first low-pressure oil passage 76a and communicated with the second low-pressure oil passage 76b. The oil flowing through the second low-pressure oil passage 76b is reduced in pressure by the orifice 85b due to a larger passage resistance than the orifice 85a, and reaches the lubricated / cooled portions A1 to B3 via the low-pressure common oil passage 76c.

  Therefore, when the electric oil pump 70 is switched from the low pressure mode to the high pressure mode, the oil passage having the small flow resistance is automatically switched from the oil passage having the small flow resistance to the oil passage having the large flow resistance in accordance with the change in the oil pressure of the line oil passage 75. It is suppressed that excessive oil is supplied to the lubricated / cooled portions A1 to B3 in the mode.

  A plurality of orifices 85c as other flow path resistance means are provided in the oil path from the low pressure common oil path 76c to the lubricated / cooled portions A1 to B3. The plurality of orifices 85c are set so that the minimum flow passage cross-sectional area of the orifice 85a of the first low-pressure oil passage 76a is smaller than the minimum flow passage cross-sectional area of the plurality of orifices 85c. That is, the flow resistance of the orifice 85a of the first low-pressure oil passage 76a is set larger than the flow resistance of the plurality of orifices 85c. At this time, the minimum channel cross-sectional area of the plurality of orifices 85c is the sum of the minimum channel cross-sectional areas of the respective orifices 85c. Thereby, it is possible to adjust the flow of a desired flow rate through the orifice 85a of the first low-pressure oil passage 76a and the orifice 85b of the second low-pressure oil passage 76b.

As described above, according to the rear-wheel drive device 1 of the present embodiment, the case 11 includes the front opening 105a that opens toward the outside, the lid member fixing portion 105b formed in the case 11, and the lid. In the attached state in which the case fixing portion 72 a formed on the member 72 is fixed, the front opening 105 a of the case 11 is closed by the lid member 72. Since both the low-pressure oil passage switching valve 73, the brake oil passage switching valve 74, the relief valve 84, and the solenoid valve 83 are fixed or attached to the lid member 72 separate from the case 11, these valves 73, 74, 84, 83 and the lid member 72 can be handled in an integrated manner, so that the assembling workability can be improved and the assembling work time can be shortened .

  An oil suction path 94 that communicates between the strainer accommodating chamber 105 and the electric oil pump 70 is formed by a lid member 72 and a strainer 71 that is detachably fixed to the lid member 72. The strainer 71 is a lid member. Only 72 is fixed. As a result, the attachment / detachment of the strainer 71 forming the oil suction path 94 to / from the case 11 is handled simultaneously with the attachment / detachment of the lid member 72, so that the attachment / detachment to / from the case 11 can be easily performed. Further, since the strainer 71 is detachable from the lid member 72, the oil suction passage 94 can be easily maintained and replaced.

  In addition, a strainer 71 for filtering oil is disposed in an oil suction path 94 that communicates between the strainer accommodating chamber 105 and the electric oil pump 70. Oil passing through the oil suction path 94 can be filtered.

  Further, at least a part of the front opening 105 a is formed at a position overlapping the storage portion of the strainer storage chamber 105, and the lid member 72 constitutes a wall surface of the strainer storage chamber 105 in the attached state. Thereby, the lid member 72 to which the electric oil pump 70 is attached and the strainer accommodating chamber 105 can be arranged close to each other, and the suction side flow path length of the electric oil pump 70 can be shortened. Further, when the lid member 72 is removed, a part of the wall surface of the strainer accommodating chamber 105 is removed, so that the inside of the strainer accommodating chamber 105 can be easily seen, and the strainer accommodating chamber 105 can be easily cleaned. It can be carried out.

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, if the first case 11L of the present embodiment 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 case 11R. As long as the electric motor 2B and the second planetary gear type speed reducer 12B are accommodated and have the right reservoir RR, the configuration is not limited to this.

In the present embodiment, the first and second motor cooling channels 120A and 120B, the first and second motor lubricating channels 121A and 121B, and the first and second planetary gear speed reducer lubricating channels 122A. , 122B is configured to branch from the front vertical oil passage 109 of the case 11. For this reason, when the case 11 and the lid member 72 are fixed, the outlet pipe 97b and the cooling / lubricating port 108b connected to the front vertical oil passage 109 are connected to form the lid member 72. Oil discharge passage 95 of electric oil pump 70, first and second electric motor cooling passages 120A and 120B, first and second electric motor lubricating passages 121A and 121B, first and second planetary gear type of case 11 All of the reduction gear lubrication channels 122A and 122B are connected. However, the present invention is not limited to such a configuration, and the front opening 105a of the case 11 is closed by the lid member 72 in the attached state in which the case 11 and the lid member 72 are fixed. 2 At least one of the motor cooling channels 120A and 120B, the first and second motor lubrication channels 121A and 121B, and the first and second planetary gear speed reducer lubrication channels 122A and 122B is provided in the lid member 72. Any structure may be used as long as it is connected to the formed oil discharge path 95.
Further, the present invention may have a configuration in which one of the electric motors 2A, 2B and the transmissions 12A, 12B is included in the case 11, and correspondingly, the first and second electric motor cooling channels 120A, 120B. The first and second motor lubrication channels 121A and 121B and the first and second planetary gear type reduction gear lubrication channels 122A and 122B may be formed in the case 11.

Further, in the present embodiment, the lower part of the strainer accommodating chamber 105 constitutes a storage part, and at least a part of the front opening 105a is arranged at a position overlapping the storage part of the strainer accommodating chamber 105, thereby closing the front opening 105a. Although at least a part of the lid member 72 is disposed so as to constitute the wall surface of the storage portion of the strainer storage chamber 105, the present invention is disposed at a position where the front opening 105a does not overlap the storage portion. May be arranged so as not to constitute the wall surface of the reservoir. For example, the strainer 71 is formed so as to extend downward from the outer edge parallel projection of the case fixing portion 72a of the lid member 72, and the front opening portion 105a is formed above the oil oil level defining the storage portion. May be.
Further, the separate member on which the liquid medium supply device of the present invention is arranged is limited to a configuration in which the electric oil pump 70 is attached to the lid member 72 that can be attached to and detached from the case 11 as in this embodiment. Instead, the electric oil pump 70 itself may be configured as an electric oil pump assembly that forms a separate member and closes the opening of the case.
In the present invention, oil is used as a liquid medium used for cooling and lubrication, but other liquids may be used.

1 Rear wheel drive system (vehicle drive system)
2A 1st electric motor 2B 2nd electric motor 10A, 10B Axle 11 Case 11A1, 11B1, 11M1 Outer wall surface 12A, 12B Planetary gear type reduction gear (transmission)
60 Hydraulic brake (hydraulic connection / disconnection means)
70 Electric oil pump (liquid medium supply device)
71 Strainer 72 Lid member (separate member)
72a Case fixing part 73 Low pressure oil passage switching valve (hydraulic drive valve)
74 Brake oil passage switching valve (hydraulic drive valve)
77 Brake oil passage (hydraulic pressure passage)
83 Solenoid valve (electrically driven valve)
84 Relief valve (hydraulic drive valve)
94 Oil suction path (suction side flow path)
95 Oil discharge path (discharge side flow path)
105 Strainer storage room (reservoir)
105a Front opening 105b Lid member fixing part (separate member fixing part)
108a Working chamber port 109 Front vertical oil passage (common passage)
110A, 110B Front horizontal oil passage 111A, 111B Front-rear horizontal oil passage 113 Lubrication oil passage 120A First cooling passage 120B Second cooling passage 121A First electric motor lubricating passage 121B Second electric motor lubricating passage 122A No. 1 planetary gear type reduction gear lubrication flow path 122B 2nd planetary gear type reduction gear lubrication flow path A1, B1 Cooled portion (cooled portion) of motor
A2, B2 Motor lubricated parts (cooled parts)
A3, B3 Planetary gear reducer lubricated part LWr Left rear wheel (left wheel)
RWr Right rear wheel (right wheel)

Claims (7)

An electric motor connected to the wheels of the vehicle;
A liquid medium supply device for supplying a liquid medium to a cooled portion which is at least one of a cooled portion and a lubricated portion of the electric motor;
A case for housing the electric motor;
A separate member detachably provided on the case;
With
The case includes an opening that opens outward.
In a mounting state in which the separate member fixing portion formed in the case and the case fixing portion formed in the separate member are fixed, the opening of the case is closed by the separate member. A driving device comprising:
In the liquid medium flow path through which the liquid medium flows, a hydraulic drive valve and an electric drive valve are arranged,
In the mounted state, the hydraulic drive valve is fixed to the inside of the separate member, and the electric drive valve is attached to the outside of the separate member. A transmission disposed on a power transmission path between a vehicle wheel and a power source;
A liquid medium supply device for supplying a liquid medium to a cooled portion that is at least one of a cooled portion and a lubricated portion of the transmission;
A case for housing the transmission;
A separate member detachably provided on the case;
With
The case includes an opening that opens outward.
In a mounting state in which the separate member fixing portion formed in the case and the case fixing portion formed in the separate member are fixed, the opening of the case is closed by the separate member. A driving device comprising:
In the liquid medium flow path through which the liquid medium flows, a hydraulic drive valve and an electric drive valve are arranged,
In the mounted state, the hydraulic drive valve is fixed to the inside of the separate member, and the electric drive valve is attached to the outside of the separate member. A hydraulic connecting / disconnecting means for connecting / disconnecting power from the power source, disposed on a power transmission path between a vehicle wheel and a power source;
A liquid medium supply device for supplying a liquid medium to the hydraulic chamber of the hydraulic disconnection means;
A case housing the hydraulic disconnection means;
A separate member detachably provided on the case;
With
The case includes an opening that opens outward.
In a mounting state in which the separate member fixing portion formed in the case and the case fixing portion formed in the separate member are fixed, the opening of the case is closed by the separate member. A driving device comprising:
In the liquid medium flow path through which the liquid medium flows, a hydraulic drive valve and an electric drive valve are arranged,
In the mounted state, the hydraulic drive valve is fixed to the inside of the separate member, and the electric drive valve is attached to the outside of the separate member.   4. The vehicle drive device according to claim 1, wherein the liquid medium supply device is attached to the outside of the separate member in the attached state. 5. The case has a storage part for storing the liquid medium,
A suction-side flow path that communicates the reservoir and the liquid medium supply device is formed by the separate member and another separate member that is detachably fixed to the separate member,
The vehicle drive device according to claim 4, wherein the other separate member is fixed only to the separate member.   The vehicle drive device according to claim 5, wherein a filtration member that filters the liquid medium is disposed in the suction side flow path. The case has a storage part for storing the liquid medium,
At least a part of the opening is formed at a position overlapping the reservoir,
4. The vehicle drive device according to claim 1, wherein in the attached state, the separate member constitutes a wall surface of the storage portion. 5.

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