JP2009303367A - Drive motor unit for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive motor unit for vehicle that ensures the lubrication performance of each rotary member certainly without enlarging the motor case. <P>SOLUTION: A drive motor unit 10 for vehicle includes a motor housing 18 which houses a motor 11 and includes a substantially tubular wall 18f to which the stator body 25 of the motor is fixed, a cooling jacket 55 which is formed annularly in the circumferential direction of the wall at the inner circumferential portion thereof and circulates a cooling medium of the motor, a lubricating oil pump 61 which supplies a lubricating oil to the motor, a lubricating oil passage which circulates the lubricating oil from the lubricating oil pump. A lubricating oil supply path 18a and a lubricating oil return path 18b constituting the lubricating oil passage are formed in the wall of the motor housing on the radial outside of the cooling jacket which is formed annularly. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle drive motor unit.

Conventionally, a permanent magnet that is supported rotatably around an axis, and includes a rotor portion in which a permanent magnet is disposed, and a stator portion that is disposed to face the periphery of the rotor portion and is wound with a coil. A vehicle drive motor unit provided with an electric motor is known. A configuration example of a vehicle drive motor unit is proposed in which the rotation of the rotor shaft of an electric motor is transmitted to a differential gear via a reduction gear, and one of a pair of output shafts of the differential gear is arranged inside the rotor shaft. (For example, refer to Patent Document 1). In the vehicle drive motor unit of Patent Document 1, the electric motor storage chamber on the right side in the vehicle width direction and the transmission storage chamber on the left side in the vehicle width direction are partitioned by a partition wall, and the electric motor is driven by a lubricating oil pump driven by the electric motor. Lubricating oil supplied to the storage chamber and the mission storage chamber can go back and forth through a lubricating oil communication passage that penetrates the lower part of the partition wall.
JP 2005-278319 A

By the way, in the vehicle drive motor unit of Patent Document 1 described above, when the rotor shaft rotates at a high speed, it is necessary to lubricate the bearing provided on the peripheral surface of the rotor shaft with the lubricating oil, and the lubricating oil passage therefor Is formed. However, in the structure of the lubricating oil passage of Patent Document 1, there is a problem that the lubricating oil circulates due to an internal pressure difference between the gear case and the motor case, deterioration due to the lubricating oil stagnating in the high temperature portion for a long time, There was a risk of cutting.
On the other hand, if the amount of lubricating oil is increased, the thermal mass increases and deterioration can be suppressed and oil shortage can be prevented. However, if the amount of lubricating oil is too large, the motor case is inclined (for example, when driving on rough roads). ), It is necessary to increase the volume of the motor case so that the lubricating oil does not become the rotational resistance of the rotor, which makes it difficult to lay out the components in the engine room (motor room) of the vehicle or increases the weight of the vehicle. There was a problem that.

  Therefore, the present invention has been made in view of the above circumstances, and provides a vehicle drive motor unit that can reliably ensure the lubrication performance of each rotating member without increasing the size of the motor case. Is.

  In order to solve the above-described problems, the invention described in claim 1 is configured such that a motor (for example, the motor 11 in the embodiment) is accommodated and a stator portion (for example, the stator 25 in the embodiment) of the motor is fixed. A motor housing (for example, the motor center case 18 in the embodiment) provided with a substantially cylindrical wall portion (for example, the wall portion 18f in the embodiment), and an inner peripheral portion of the wall portion along the circumferential direction of the wall portion. A cooling jacket (for example, a water jacket 55 in the embodiment) in which a cooling medium for cooling the motor circulates, and a lubricating oil pump (for example, the lubricating oil in the embodiment) that supplies lubricating oil to the motor. Pump 61) and a lubricating oil passage for circulating the lubricating oil from the lubricating oil pump (for example, the lubricating oil communication passage 14a in the embodiment) 14f, 16a to 16i, 18a to 18c, and 20a to 20f), a lubricating oil forward path (for example, the lubricating oil path) (for example, the vehicle driving motor unit 10 in the embodiment) The lubricating oil supply passage 18a) and the lubricating oil return passage (for example, the lubricating oil return passage 18b in the embodiment) in the embodiment are formed in the wall of the motor housing on the radially outer side of the cooling jacket formed in an annular shape. It is characterized by being.

  According to a second aspect of the present invention, there is provided an oil level height adjusting passage that communicates between the lubricating oil passage and the internal space of the motor housing in which the motor is accommodated (for example, the lubricating oil communication hole in the embodiment). 18c) is formed.

  According to a third aspect of the present invention, there is provided a breather passage (for example, the breather passage 18d in the embodiment) communicating between the lubricating oil passage and the internal space of the motor housing, on the radially outer side of the cooling jacket, It is formed in the wall part of a motor housing.

  According to a fourth aspect of the present invention, the lubricating oil that has passed through the forward direction of the lubricating oil is supplied to the rotor rotation shaft support portion (for example, the ball bearing 30 in the embodiment) of the motor, and the rotor rotation shaft support portion is lubricated. It is characterized in that the lubricant oil after being guided is guided to the lubricant oil return path.

  According to the first aspect of the present invention, the lubricating oil circulation efficiency can be improved by forming the lubricating oil passage dedicated to the lubricating oil including the lubricating oil forward path and the lubricating oil return path in the motor housing. In addition, since the lubricating oil passage is formed in the motor housing, it is possible to suppress an increase in the size of the vehicle drive motor unit as compared with a case where a lubricating oil communication pipe is provided outside the conventional motor housing. . Further, since the lubricating oil passage is formed radially outside the cooling jacket in the wall portion of the motor housing, the lubricating oil can be efficiently heat-exchanged with the cooling jacket refrigerant, and the temperature rise of the lubricating oil can be reduced. it can. Therefore, the lubricating performance of each rotating member can be reliably ensured by the lubricating oil. Furthermore, since the lubricating oil passage only needs to form a through hole along the axial direction in the wall portion of the motor housing, the lubricating oil passage can be efficiently manufactured without complicating the manufacturing process.

  According to the second aspect of the present invention, spaces are formed on both sides of the motor housed in the motor housing, and lubricating oil is stored in each space, but an oil level height adjusting passage is formed. By doing so, it becomes easy to keep the oil level of the lubricating oil uniform. Further, the lubricating oil stored in each space is received by the stator portion of the motor, but since the adjustment passage of the oil level is formed outside the cooling jacket in the radial direction of the cooling jacket, the lubricating oil Can efficiently exchange heat with the refrigerant in the cooling jacket, and deterioration due to a rise in temperature of the lubricating oil can be suppressed. Therefore, the amount of lubricating oil can be optimized, and the increase in size of the motor housing can be suppressed.

  According to the third aspect of the present invention, the spaces are formed on both sides of the motor accommodated in the motor housing, and the circulation of the lubricating oil and the adjustment of the oil level are smoothly conducted through the spaces. Although it is necessary to perform this, the pressure difference in each space can be made substantially uniform by forming the breather passage. In addition, each space is filled with breathing air containing lubricating oil mist due to splashing of lubricating oil by the rotor, but the breather passage is formed outside the cooling jacket in the radial direction of the cooling jacket inside the motor housing wall. Can efficiently exchange heat with the refrigerant in the cooling jacket, and the lubricating oil and air can be effectively separated in the breather passage to suppress mist formation. Therefore, the amount of lubricating oil can be optimized, and the increase in size of the motor housing can be suppressed.

  According to the fourth aspect of the present invention, since the lubricating oil can be positively supplied to the rotor rotating shaft support portion, the rotor rotating shaft support portion can be efficiently cooled, and the rotor rotating shaft support portion can be cooled. It is possible to reliably ensure the lubrication performance.

Next, an embodiment of the present invention will be described with reference to FIGS. In addition, the definition which shows the attachment direction and position of each apparatus in this embodiment shall define a right direction and a left direction toward a vehicle advancing direction by making a vehicle advancing direction ahead.
As shown in FIGS. 1 and 3, the vehicle drive motor unit 10 includes a motor 11, a speed reducer 12, and a differential gear 13, and its outer case is located at the left end in the vehicle width direction. 14, a motor / transmission case 16 coupled to the right end of the mission case 14 with a bolt 15, a substantially cylindrical motor center case 18 coupled to the right end of the motor / mission case 16 with a bolt 17, and a motor center case 18 Motor side case 20 coupled to the right end of the motor side case 20 by a bolt 19, a center shaft bearing support 22 coupled to the right end of the motor side case 20 by a bolt 21, and an intermediate case coupled to the inner surface of the transmission case 14 by a bolt 23. 24. The motor 11 is housed inside the motor / mission case 16, the motor center case 18, and the motor side case 20, and the speed reducer 12 and the differential gear 13 are housed inside the mission case 14 and the motor / mission case 16. Is done.

  The motor 11 includes a stator 25 that is fitted and fixed to the inner peripheral surface of the motor center case 18 by shrink fitting, and a rotor 26 that is disposed inside the stator 25 so as to be rotatable about the axial direction. The stator 25 is configured by stacking a plurality of magnetic plate materials, and includes a plurality of stator cores 27 arranged in the circumferential direction and a plurality of coils 28 wound around the stator core 27. The rotor 26 includes a rotor shaft 31 rotatably supported by ball bearings 29 and 30 on the motor / mission case 16 and the motor side case 20, respectively, and a rotor core 32 made of a laminated steel plate fixed to the rotor shaft 31, The plurality of permanent magnets 33 are embedded in the outer periphery of the rotor core 32. The rotor core 32 is formed with a plurality of through holes 32a penetrating in the axial direction.

  A water jacket 55 is provided on the wall 18 f of the motor center case 18 along the peripheral surface of the stator 25. By flowing the coolant through the water jacket 55, heat generated from the motor 11 can be absorbed, and heat is exchanged with the lubricating oil passing through the lubricating oil supply passage 18a and the lubricating oil return passage 18b, so that the temperature of the lubricating oil is increased. It is configured so that it can be lowered.

  The speed reducer 12 includes a speed reducer shaft 36 supported by a roller bearing 34 and a ball bearing 35 on the transmission case 14 and the motor / mission case 16, respectively. The speed reducer shaft 36 includes a second speed reduction gear 37, a parking gear. 38 and a final drive gear 39 are provided. The first reduction gear 40 provided at the left end of the rotor shaft 31 meshes with the second reduction gear 37 of the reduction gear shaft 36, and the final drive gear 39 of the reduction gear shaft 36 meshes with the final driven gear 41 of the differential gear 13. It is configured as follows.

  The differential gear 13 is differentially supported on a transmission case 14 and an intermediate case 24 via taper roller bearings 42 and 43, respectively, and a differential case 44 is rotatably supported on a differential case 44 via a pinion pin 45. A pair of differential pinions 46 and 46 and a pair of differential side gears 47 and 47 simultaneously meshing with both of these differential pinions 46 and 46 are provided, and a final driven gear 41 is fixed to the outer periphery of the differential case 44. .

  A left drive shaft 48 whose right end is splined to the left differential side gear 47 extends through the differential case 44 and the transmission case 14 to the left in the vehicle width direction. A center shaft 49 whose left end is splined to the right differential side gear 47 extends through the differential case 44, the transmission case 14, and the hollow rotor shaft 31 to the right in the vehicle width direction. A right drive shaft 51 is splined to a center shaft 49 supported at the right end of the center shaft bearing support 22 via a ball bearing 50.

  Therefore, when the motor 11 is driven, the torque of the rotor shaft 31 is changed from the first reduction gear 40 → the second reduction gear 37 → the reduction gear shaft 36 → the final drive gear 39 → the final driven gear 41 → the differential case 44 → the differential pinion 46, 46 → transmitted to the differential side gears 47, 47 and distributed to the left drive shaft 48, the center shaft 49 and the right drive shaft 51 at a predetermined ratio according to the turning state of the vehicle.

  Next, a lubrication system for the motor 11, the speed reducer 12, and the differential gear 13 will be described.

  As shown in FIG. 5, a lubricating oil pump 61 that supplies lubricating oil to the motor 11, the speed reducer 12, and the differential gear 13 is formed of a trochoid pump, and has a circular pump chamber 16a formed on the left side surface of the motor / mission case 16. (See FIG. 5) an outer rotor 62 rotatably supported, an inner rotor 63 having external teeth meshing with internal teeth of the outer rotor 62, a pump shaft 64 rotatably supporting the inner rotor 63, and a motor A pump cover 66 that is fixed to the left side surface of the transmission case 16 with a bolt 65 and closes the pump chamber 16a is provided, and a pump shaft 64 that is supported at the right end by the motor / transmission case 16 is provided on the pump cover 66. A pump driving gear 68 provided at the left end of the ball bearing 67 is passed through the first bearing. It is meshed with the speed gear 40.

  The suction port 16 b of the lubricating oil pump 61 communicates with the lubricating oil storage chamber 71 at the bottom of the motor / transmission case 16 and the transmission case 14 via a lubricating oil suction passage 16 c and a strainer 69 provided in the motor / transmission case 16. (See FIG. 1). The discharge port 16 d of the lubricating oil pump 61 is connected to the lubricating oil storage chamber 71 at the bottom of the motor / transmission case 16 and the transmission case 14 via the lubricating oil discharge passage 16 e provided in the motor / mission case 16 and the relief valve 70. It communicates with a tapered roller bearing 43 that supports the right end of the differential case 44 via a lubricating oil passage 72 made of a pipe material and a lubricating oil supply passage 24a formed in the intermediate case 24 (see FIG. 3). .

  Returning to FIG. 1, the high-pressure lubricating oil supply passage 16 f (see FIG. 4) extending upward from the discharge port 16 d of the lubricating oil pump 61 to the inside of the motor / mission case 16 is formed inside the hollow speed reducer shaft 36. It passes through the oil supply passage 36 a and communicates with the lubricating oil supply passages 14 a and 14 b of the transmission case 14. The lubricating oil branched into the lubricating oil supply passage 14 a is discharged from the lubricating oil supply pipe 73 and lubricates the meshing portions of the final drive gear 39 and the final driven gear 41, the ball bearing 35 and the ball bearing 29 to the lubricating oil storage chamber 71. Returned. The lubricating oil branched into the lubricating oil supply passage 14b is returned to the lubricating oil storage chamber 71 after lubricating the roller bearing 34 and the differential gear 13, and the lubricating oil branched into the lubricating oil supply passage 14c from the lubricating oil supply passage 14b. The oil lubricates the left tapered roller bearing 42 and returns to the lubricating oil reservoir 71. Note that the high-pressure lubricating oil supply passage 16 f is formed with a lubricating oil supply passage 16 n that branches in the middle and supplies the lubricating oil to the ball bearing 29.

  The lubricating oil supply passage 16g branched from the upper end of the high pressure lubricating oil supply passage 16f of the motor / mission case 16 is connected to the motor side case 20 from the lubricating oil supply passage 18a formed in the wall portion 18f of the motor center case 18. After lubricating the ball bearing 30 that supports the right end of the rotor shaft 31 through the lubricating oil supply passages 20a, 20b, and 20c formed in the wall portion, the lubricating oil return passage formed in the wall portion of the motor side case 20 20d, 20e, a lubricating oil return passage 18b formed in the wall portion 18f of the motor center case 18, a lubricating oil return passage 16i formed in the wall portion of the motor / mission case 16, and a wall portion of the transmission case 14. The lubricant is returned to the lubricant reservoir 71 through the lubricant return passage 14f and the opening 14g. The lubricating oil supply passage 20f branched from the lubricating oil supply passage 20c of the motor side case 20 has a ball bearing 50 that supports the right end of the center shaft 49 via the lubricating oil supply passage 22a formed in the center shaft bearing support 22. After the lubrication, the lubricant joins the lubricant return passage 20d and returns to the lubricant reservoir 71 (see FIG. 6).

  Returning to FIG. 3, the electric motor storage chamber 74 defined by the motor / mission case 16, the motor center case 18 and the motor side case 20 is partitioned into a right chamber 74 a and a left chamber 74 b by the stator 25 and the rotor 26 of the motor 11. ing. Although the right chamber 74a and the left chamber 74b communicate with each other by the through hole 32a formed in the rotor core 32, the lubricating oil cannot substantially pass through the through hole 32a during the operation in which the rotor 26 rotates at high speed. Therefore, the right chamber 74a and the left chamber 74b communicate with each other through the lubricating oil communication hole 18c formed in the wall portion 18f of the motor center case 18 (see FIG. 2). Further, the left end of the lubricating oil communication hole 18 c of the motor center case 18 is located in a lower part (lubricating oil storage chamber 71) of the mission storage chamber 75 defined by the motor / mission case 16 and the transmission case 14, and the motor / transmission case 16 and Communicating through the lubricating oil communication passages 16h and 14d and the opening 14e formed in the mission case 14.

  As shown in FIG. 6, the resolver 76 of the motor 11 includes a disc-shaped resolver rotor 77 provided at the right end of the rotor shaft 31 and a plurality of resolvers 76 fixed to the motor side case 20 with bolts 78 so as to surround the outer periphery thereof. And the resolver coil 79. A plurality of concave portions and convex portions (not shown) are alternately formed on the outer periphery of the resolver rotor 77, and by magnetically detecting the size of the air gap between the concave and convex portions and the resolver coil 79, The rotational position of the motor 11 can be detected.

  The resolver rotor 77 fitted to the outer periphery of the rotor shaft 31 is fixed by being sandwiched between a pair of stoppers 80 and 81 press-fitted on both sides in the axial direction, and protrudes from the outer periphery of the stopper 80 on the left side. A flange 80 a is disposed opposite to the inner periphery of an annular magnetic shield 82 that is fastened to the motor side case 20 with a bolt 78 with a slight gap. The magnetic shield 82 is for preventing the magnetism generated by the motor 11 from acting on the resolver coil 79 and affecting the detection accuracy, and is arranged so as to block between the motor 11 and the resolver coil 79. ing.

  The ball bearing 30 that supports the right end of the rotor shaft 31 to the motor side case 20 includes an inner race 30b and an outer race 30c that support a plurality of balls 30a, and lubricating oil is provided between the inner race 30b and the outer race 30c. Shield 30d is provided to prevent the distribution of Therefore, the lubricating oil supplied from the lubricating oil supply passage 20c of the motor side case 20 is held in the first oil chamber 83 defined by the shield 30d of the ball bearing 30, the flange 80a of the stopper 80, and the magnetic shield 82. Thus, the ball bearing 30 can be effectively lubricated. Then, the lubricating oil that has lubricated the ball bearing 30 passes through the communication hole 20j formed in the motor side case 20, and is guided to the lubricating oil return passage 20d.

  Further, a small amount of lubricating oil leaking from the shield 30 d of the ball bearing 30 is stored in the right chamber 74 a of the electric motor storage chamber 74, and is placed below the transmission case 14 via the lubricating oil communication passage 18 c of the motor center case 18. It circulates to a certain lubricating oil storage chamber 71. Further, the lubricating oil supplied from the lubricating oil supply passage 22 a of the center shaft bearing support 22 is a flange 80 a of the stopper 80, a magnetic shield 82, and a seal member 84 disposed between the center shaft 49 and the center shaft bearing support 22. And the ball bearing 50 can be effectively lubricated.

  Next, breathing of the electric motor storage chamber 74 and the mission storage chamber 75 will be described.

  As shown in FIG. 3, the second oil chamber 85 communicates with the breather passages 20g and 20h of the motor side case 20, and the right chamber 74a of the electric motor storage chamber 74 communicates with the breather passage 20h via the breather passage 20i. Further, the breather passage 20h communicates with the first breather chamber 86, which is the upper portion of the mission storage chamber 75, through the breather passage 18d of the motor center case 18 and the breather passage 16j of the motor / mission case 16. A small-capacity second breather chamber 87 is formed above the first breather chamber 86. The first and second breather chambers 86 and 87 communicate with each other through a communication hole 16m, and the second breather chamber 87 is connected via a breather pipe 88. Communicate with the open air. The left chamber 74 b of the electric motor storage chamber 74 and the mission storage chamber 75 communicate with each other via a communication hole 16 k formed in the motor / mission case 16.

  The lubricating oil supply passage 18a, the lubricating oil return passage 18b, the lubricating oil communication hole 18c, and the breather passage 18d are formed in the wall portion 18f of the motor center housing 18 so as to be spaced apart in the circumferential direction (see FIG. 2). ).

  Next, the lubrication action and breathing action of this embodiment having the above-described configuration will be described.

  When the pump shaft 64 of the lubricating oil pump 61 is rotated by the pump drive gear 68 that meshes with the first reduction gear 40 provided on the rotor shaft 31 of the motor 11, the volume of the working chamber formed between the outer rotor 62 and the inner rotor 63 is increased. High pressure lubricating oil supply passage formed continuously in the motor / transmission case 16 from the discharge port 16d through which the lubricating oil in the lubricating oil storage chamber 71 is sucked in via the lubricating oil suction passage 16c and the suction port 16b. Since 16f is extended in a substantially straight line toward the upper side, the high-pressure lubricating oil supply passage 16f can be made short and simple to reduce the flow resistance of the lubricating oil and to reduce the driving load of the lubricating oil pump 61. . Moreover, since the lubricating oil branched into two branches from the vicinity of the upper end of the high-pressure lubricating oil supply passage 16f is supplied by gravity to the portions to be lubricated on the electric motor storage section 74 side and the transmission storage section 75 side, the stored lubricating oil is repelled. In addition to minimizing energy loss compared to the case of supplying to the lubricated portion, the lubricated portions on the electric motor storage portion 74 side and the transmission storage portion 75 side are covered with the minimum amount of lubricating oil. It can be evenly lubricated.

  A part of the lubricating oil discharged from the lubricating oil pump 61 driven by the motor 11 is supplied to the mission storage chamber 75 to lubricate and cool each gear and each bearing, and then the transmission case 14 and the motor / mission case 16. Is returned to the lubricating oil storage chamber 71 at the bottom. Further, another part of the lubricating oil discharged from the lubricating oil pump 61 is supplied to the electric motor storage chamber 74 to lubricate and cool the bearings and the motor 11, and then returned to the bottom of the electric motor storage chamber 74. . At this time, since the right chamber 74a and the left chamber 74b of the electric motor 74 communicate with each other via the lubricant communication hole 18c, the lubricant level (height) L of the right chamber 74a and the left chamber 74b (see FIG. 3). Are almost identical. Further, since the bottom of the electric motor storage chamber 74 and the lubricating oil storage chamber 71 of the mission storage chamber 75 communicate with each other via the lubricating oil communication passages 16h and 14d and the opening 14e, the lubricating oil level of the electric motor storage chamber 74 is increased. And the lubricating oil level in the lubricating oil storage chamber 71 of the mission storage chamber 75 are substantially the same.

  Thus, since the electric motor storage chamber 74 and the mission storage chamber 75 communicate with each other through the lubricating oil communication paths 16h and 14d, the lubricating oil can be moved back and forth, and the electric motor storage chamber 74 can be used as a lubricating oil server. Oil level management can be stabilized.

  Further, since the first oil chamber 83, the second oil chamber 85, and the mission storage chamber 75 communicate with each other through the lubricant return passages 20d, 20e, 18b, 16i, and 14f, the first oil chamber 83 and the second oil chamber. Lubricating oil recovery from 85 to the mission storage chamber 75 can be stabilized, and the distribution of lubricating oil in each part can be optimized.

  Further, there is a problem that when the lubricating oil that has lubricated the ball bearings 30 and 50 flows into the electric motor storage chamber 74, the stirring resistance of the lubricating oil by the rotor 26 increases, but there is a problem between the first oil chamber 83 and the electric motor storage chamber 74. The space between the first oil chamber 83 and the electric motor storage chamber 74 is reliably reduced because the space is partitioned by the ball bearing 30 and the shield 30d is provided on the ball bearing 30 to reduce the flow of the lubricant. be able to. Moreover, since the space between the second oil chamber 85 and the first oil chamber 83 is shielded by using the magnetic shield 82 of the resolver 76, the second oil chamber 85 flows into the electric motor storage chamber 74 via the first oil chamber 83. The amount of lubricating oil to be reduced can also be reduced, and the stirring resistance of the lubricating oil by the rotor 26 can be further effectively reduced.

  Furthermore, since the upper part of the second oil chamber 85 communicates with the breather passage 20g, the lubricating oil and the air can be effectively separated in the second oil chamber 85.

  Further, the breathing air in the first and second oil chambers 83 and 85 communicating with each other is the first breather chamber at the upper part of the mission storage chamber 75 in the route of the breather passage 20g → the breather passage 20h → the breather passage 18d → the breather passage 16j. Communicate with 86. Further, the breathing air in the right chamber 74a of the electric motor storage chamber 74 communicates with the first breather chamber 86 at the upper part of the mission storage chamber 75 through the route of the breather passage 20i → the breather passage 18d → the breather passage 16j. The breathing air in the left chamber 74 b of the electric motor storage chamber 74 passes through the communication hole 16 k penetrating the motor / mission case 16 and communicates with the first breather chamber 86 at the upper portion of the mission storage chamber 75.

  The breathing air supplied from the electric motor storage chamber 74 to the first breather chamber 86 as described above merges with the breathing air generated in the mission storage chamber 75, and passes through the communication hole 16m from there to the second breather chamber. The lubricating oil mist contained in the breathing air is finally separated and returned to the lubricating oil storage chamber 71 by gravity, and only air is discharged from the second breather chamber 87 through the breather pipe 88 to the atmosphere. The

  As described above, of the electric motor storage chamber 74 and the mission storage chamber 75 partitioned by the motor / mission case 16, the left chamber 74b on the mission storage chamber 75 side of the electric motor storage chamber 74 with the rotor 26 of the motor 11 interposed therebetween. And the right chamber 74a opposite to the mission storage chamber 75, and the left chamber 74b communicates with the mission storage chamber 75 through the communication hole 16k formed in the motor / mission case 16, and the right chamber 74a The second oil chambers 83 and 85 are disposed in the upper part of the mission storage chamber 75 via breather passages 20g, 20h, 20i, 18d, and 16j formed in the walls of the motor side case 20, the motor center case 18, and the motor / mission case 16. The first breather chamber 86 is communicated with the first breather chamber 86, and the second breather chamber 87 is connected to the first breather chamber 86 through the communication hole 16m. Since the second breather chamber 87 is communicated with the atmosphere via the breather pipe 88, the first and second breather chambers 86 and 87, which are part of the mission storage chamber 75, are connected to the electric motor storage chamber 74 and the mission storage chamber. Lubricating oil mist can be separated from the breathing air generated in both the chambers 75, and the structure of the breather device is simplified compared to the case where the breather devices are provided in the electric motor storage chamber 74 and the mission storage chamber 75, respectively. Can do. The breathing air generated in the electric motor storage chamber 74 is likely to be misted by the splashing of the lubricating oil by the rotor 26 of the motor and the heat generation of the stator 25, but the breather passage 18 d passes through the wall of the motor center case 18. Since it is formed radially outside of the water jacket 55 within 18f, the breathing air can be efficiently exchanged with the coolant of the water jacket 55, and the lubricating oil mist is effectively separated from the breathing air to suppress mist formation. can do. Therefore, the amount of lubricating oil can be optimized, and the size of the motor center case 18 (vehicle drive motor unit 10) can be suppressed.

  Further, the lubricating oil circulation efficiency can be improved by forming a lubricating oil passage dedicated to the lubricating oil including the lubricating oil supply passage 18a and the lubricating oil return passage 18b in the wall portion 18f of the motor center case 18. Further, since the lubricating oil passage is formed in the motor center case 18, the vehicle drive motor unit 10 is prevented from being enlarged compared to the case where a lubricating oil communication pipe is provided outside the conventional motor housing. be able to. Further, since the lubricating oil passage is formed in the wall portion 18f of the motor center case 18 on the radially outer side of the water jacket 55, the lubricating oil can be efficiently heat-exchanged with the refrigerant of the water jacket 55, and the temperature of the lubricating oil can be increased. Can be reduced. Therefore, the lubricating performance of each rotating member can be reliably ensured by the lubricating oil. Furthermore, since the lubricating oil passage only needs to be formed in the wall portion 18f of the motor center case 18 in the axial direction, the lubricating oil passage can be efficiently manufactured without complicating the manufacturing process.

  Further, spaces (right chamber 74a and left chamber 74b) are formed on both sides of the motor 11 accommodated in the motor center case 18, and lubricating oil is stored in each space to circulate the lubricating oil and the oil. Although the pressure difference is generated by adjusting the surface height, the oil level of the lubricating oil can be easily maintained uniformly by forming the breather passage 18d and the lubricating oil communication hole 18c. Therefore, the amount of lubricating oil can be optimized, and the size of the motor center case 18 (vehicle drive motor unit 10) can be suppressed. Further, since the lubricating oil communication hole 18c is formed outside the water jacket 55 in the radial direction of the water jacket 55 in the wall portion 18f of the motor center case 18, the lubricating oil can efficiently exchange heat with the refrigerant of the water jacket 55. The temperature of the lubricating oil stored in the right chamber 74a and the left chamber 74b of the storage chamber 74 can be reduced. Therefore, deterioration due to temperature rise of the lubricating oil received by the stator 25 can be suppressed, and the lubricating performance of each rotating member can be reliably ensured by the lubricating oil.

  And since lubricating oil can be actively supplied to each rotating member (ball bearing 30,50) in the position away from the lubricating oil pump 61 by comprising as mentioned above, ball bearings 30,50 are changed. It can be cooled efficiently and the lubricating performance of the ball bearings 30 and 50 can be reliably ensured.

Note that the present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the specific structure and shape described in the embodiment are merely examples, and can be changed as appropriate.
For example, in the present embodiment, the electric motor storage chamber is arranged on the right side in the vehicle width direction and the mission storage chamber is arranged on the left side in the vehicle width direction, but the positional relationship may be reversed, and the electric motor The storage room and the mission storage room may be arranged in the longitudinal direction of the vehicle body.

It is a longitudinal cross-sectional view of the drive motor unit for vehicles in embodiment of this invention. It is an AA arrow line view of FIG. It is sectional drawing which follows the BB line of FIG. It is CC line arrow line view of FIG. It is the D section enlarged view of FIG. It is the E section enlarged view of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle drive motor unit 11 ... Motor 14a-14f ... Lubricating oil communication path (lubricating oil path) 16a-16i ... Lubricating oil communication path (lubricating oil path) 18 ... Motor center case 18a ... Lubricating oil supply path (lubricating oil) 18b: Lubricating oil return path (lubricating oil path, lubricating oil return path) 18c: Lubricating oil communication hole (lubricating oil path, oil level height adjusting path) 18f: Wall portions 20a-20f: Lubricating oil series Passage (lubricating oil passage) 25 ... Stator 30 ... Ball bearing (rotor rotating shaft support) 55 ... Water jacket (cooling jacket) 61 ... Lubricating oil pump

Claims (4)

A motor housing having a substantially cylindrical wall portion in which a motor is accommodated and a stator portion of the motor is fixed;
A cooling jacket that is formed in an annular shape along the circumferential direction of the wall portion in the inner peripheral portion of the wall portion, and in which a cooling medium for cooling the motor circulates;
In a vehicle drive motor unit, comprising: a lubricating oil pump that supplies lubricating oil to the motor; and a lubricating oil passage that circulates the lubricating oil from the lubricating oil pump.
The vehicular drive motor characterized in that a lubricant forward path and a lubricant return path constituting the lubricant passage are formed in a wall portion of the motor housing outside in the radial direction of the cooling jacket formed in an annular shape. unit.   2. The vehicle drive motor according to claim 1, wherein an oil level height adjusting passage that communicates between the lubricating oil passage and an inner space of the motor housing in which the motor is accommodated is formed. unit.   The breather passage communicating between the lubricating oil passage and the inner space of the motor housing is formed in a wall portion of the motor housing outside the cooling jacket in a radial direction. The vehicle drive motor unit according to 2.   The lubricating oil that has passed through the forward path of the lubricating oil is supplied to the rotor rotating shaft support portion of the motor, and the lubricating oil after lubricating the rotor rotating shaft support portion is guided to the lubricating oil return path. The vehicle drive motor unit according to claim 1, wherein the vehicle drive motor unit is a vehicle drive motor unit.

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