JP5049892B2 - Vehicle drive motor unit - Google Patents

Description

  The present invention relates to a vehicle drive motor unit.

Conventionally, a permanent magnet motor having a rotor part rotatably supported around an axis, a rotor part provided with a permanent magnet, and a stator part arranged oppositely around the rotor part and wound with a coil. There is known a vehicle drive motor unit including Here, since the stator part (coil) generates heat when the permanent magnet motor is driven, a rotating electrical machine (vehicle drive motor unit) with improved cooling capacity of the stator part has been proposed. (For example, refer to Patent Document 1). In Patent Document 1, an oil discharge path and an oil suction path (oil path) are formed in a wall portion of a case (motor housing) in order to supply cooling oil to the stator portion, and the cooling oil is circulated using an oil pump. Yes.
JP 2006-197774 A

Here, in the case of a motor having a rotor portion and a stator portion, generally, the rotor portion is attached by, for example, press-fitting into the rotor shaft, and the rotor shaft is attached to the motor housing via a bearing. It is configured to be rotatable. Therefore, in order to maintain the lubricating performance of the bearing, it is necessary to continuously supply lubricating oil to the bearing.
However, the rotating electrical machine of Patent Document 1 is not configured to actively supply lubricating oil (cooling oil) to the ball bearing.

  In the case of a rotating electrical machine equipped with a rotor shaft, a resolver for detecting the rotation angle of the rotor shaft is provided. However, in order to reduce the size of the motor, a bearing must be arranged in the immediate vicinity of the resolver. It becomes. In the case of such a configuration, there is a possibility that the resolver may be immersed in the lubricating oil, which may reduce the detection accuracy of the resolver.

  Therefore, the present invention has been made in view of the above-described matters, and can ensure the lubrication performance of each rotating member without increasing the size of the motor case and maintain the detection accuracy of the resolver. A vehicle drive motor unit is provided.

  In order to solve the above problems, the invention described in claim 1 is directed to a rotor portion (for example, the rotor 26 in the embodiment) and a stator portion (for example, the stator in the embodiment) of a motor (for example, the motor 11 in the embodiment). 25) and 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 the motor housing inserted into the rotor portion. A rotor shaft (for example, the rotor shaft 31 in the embodiment) that is rotatably supported with respect to the rotor, a resolver (for example, the resolver 76 in the embodiment) for detecting the rotational position of the rotor shaft, and lubricating oil in the motor. Lubricating oil pump (for example, lubricating oil pump 61 in the embodiment), and the lubricating oil Lubricating oil passages (for example, lubricating oil communication passages 14a to 14f, 16a to 16i, 18a to 18c, and 20a to 20f in the embodiments) for circulating lubricating oil from the pump, and an internal space of the motor housing (for example, the embodiment) Drive motor unit 74) and a resolver storage space (for example, storage space 90 in the embodiment) and a breather passage (for example, the breather passage 20g in the embodiment) that communicates with the external space. (For example, in the vehicle drive motor unit 10 in the embodiment), the lubricating oil passage is formed so as to pass through the storage space of the resolver, and an annular resolver stator of the resolver (for example, the resolver stator 91 in the embodiment). ) (For example, the inner circumference in the embodiment) A magnetic pole is formed in 91a), and both side spaces (for example, the first oil chamber 83 in the embodiment) of the storage space partitioned by the resolver on the outer peripheral portion (for example, the outer peripheral portion 91b in the embodiment) of the resolver stator. , The second oil chamber 85) is formed, and a through hole (for example, the through hole 93 in the embodiment) is formed.

  The invention described in claim 2 is characterized in that a plurality of the through holes are formed.

  According to a third aspect of the present invention, the through hole is formed below the rotor shaft when the resolver stator is attached to the motor housing, and an inflow hole (for example, an implementation) connected to the lubricating oil passage. Inflow holes 20k, 22b) in the embodiment are formed above the rotor shaft in the storage space, and an outflow hole (for example, the outflow hole 20l in the embodiment) connected to the lubricating oil passage is formed in the storage space. It is characterized by being formed below the rotor shaft.

  The invention described in claim 4 is characterized in that the through hole is formed above the rotor shaft when the resolver stator is attached to the motor housing.

  According to a fifth aspect of the present invention, a shield plate (for example, the magnetic shield 82 in the embodiment) is provided on the resolver on the side where the motor is disposed, and the shield plate has a plate in the same phase as the through hole. Through holes (for example, the through holes 96 and 97 in the embodiment) are formed.

  The invention described in claim 6 is characterized in that the resolver stator is formed in a ring shape having a substantially circular outer shape through which the rotor shaft can be inserted.

According to the first aspect of the invention, the lubricating oil circulation efficiency can be improved by forming the lubricating oil passage exclusively for the lubricating oil in the motor housing. In addition, since the lubricating oil passage is formed in the motor housing and the resolver storage space is configured as a part of the lubricating oil passage, compared to the conventional case where a lubricating oil communication pipe is provided outside the motor housing. Thus, an increase in the size of the vehicle drive motor unit can be suppressed. Further, since the lubricating oil passage only needs to be formed in the wall portion of the motor housing in the axial direction, the lubricating oil passage can be efficiently manufactured without complicating the manufacturing process.
Further, by providing the breather passage, the pressure in each of the internal space of the motor housing and the storage space of the resolver can be made substantially uniform, so that the circulation of the lubricating oil communicating with each space and The oil level can be adjusted smoothly.
Furthermore, the function of the resolver can be ensured by forming the magnetic poles on the inner periphery of the resolver stator. Further, by providing the through hole in the outer peripheral portion of the resolver stator, it is possible to contribute to the weight reduction of the vehicle drive motor unit and to suppress the lubricant oil from staying in the resolver storage space. Further, by supplying lubricating oil to the resolver storage space, it is possible to reliably ensure the lubrication performance of the bearings arranged so as to face the resolver storage space. Since the lubricating oil passage is formed so that the lubricating oil flows out from the resolver storage space, the resolver detection accuracy can be improved without the resolver being immersed in oil. As a result, it is possible to reduce the size of the lubricating oil pump and improve the reliability of the motor response to the torque command value.

  According to the second aspect of the present invention, the vehicle drive motor unit can be further reduced in weight by providing a plurality of through holes.

  According to the third aspect of the invention, the lubricating oil inflow hole is provided above the storage space, and the lubricating oil outflow hole is provided below the storage space, so that the lubricating oil passes smoothly through the storage space. It is possible to prevent the lubricating oil from staying in the resolver storage space.

  According to the invention described in claim 4, the through hole formed above the rotor shaft can function as a breather through hole. That is, the breathing air in the storage space partitioned by the resolver can be smoothly guided to the breather passage. As a result, the oil level is made uniform, and the oil pump can be miniaturized. Further, the through hole formed at the upper side is also used as a passage route for the lubricating oil, and the lubricating oil can be supplied to the bearing more reliably.

  According to the invention described in claim 5, by providing the shield plate, electromagnetic noise from the motor side to the resolver can be removed, and the detection accuracy of the resolver can be improved. Further, by forming a plate through hole in the shield plate, it can function as an oil passage or a breather passage.

  According to the sixth aspect of the present invention, the toughness against electromagnetic noise generated from the motor side can be improved, and the angle detection error of the resolver can be reduced. As a result, the reliability of the motor response to the torque command value can be improved.

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 reduction gear 12 is disposed in the mission case 14 and the motor / mission case 16. Further, the differential gear 13 is disposed in the mission case 14 and the intermediate case 24. On the left side of the differential gear 13, a left drive shaft 48 extends through the transmission case 14 to the left in the vehicle width direction. Further, on the right side of the differential gear 13, a center shaft 49 passes through the inside of the hollow rotor shaft 31 and extends to the right side 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 transmitted to each gear, and the left drive shaft 48, the center shaft 49, and the right drive shaft 51 are transmitted at a predetermined ratio according to the turning state of the vehicle. Distributed.

  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. An outer rotor 62 rotatably supported on the inner rotor 63, an inner rotor 63 having outer teeth meshing with inner teeth of the outer rotor 62, a pump shaft 64 that rotatably supports the inner rotor 63, and a motor / mission case 16. A pump cover 66 that is fixed to the left side surface with a bolt 65 and closes the pump chamber 16 a is provided. A pump shaft 64 supported on the motor / mission case 16 on the right end passes through a ball bearing 67 provided on the pump cover 66. The pump drive gear 68 provided at the left end of the first reduction gear 40 It meshes.

  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, lubricates the meshing portions of various gears and various bearings, and returns to the lubricating oil storage chamber 71. The lubricating oil branched to the lubricating oil supply passage 14b is also returned to the lubricating oil storage chamber 71 after lubricating the bearings and gears, and the lubricating oil branched from the lubricating oil supply passage 14b to the lubricating oil supply passage 14c Lubricate and return to the lubricating oil reservoir 71. The high pressure lubricating oil supply passage 16f is formed with a lubricating oil supply passage 16n that branches off in the middle and supplies the lubricating oil to the ball bearing 29 (see FIG. 4).

  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 is disposed in a storage space 90 formed in the motor side case 20, and a disc-shaped resolver rotor 77 provided at the right end of the rotor shaft 31. A resolver stator 91 is wound around a plurality of coils 79 fixed to the motor side case 20 with bolts 78 so as to surround the outer periphery thereof. 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 stator 91, The rotational position of the motor 11 (rotor shaft 31) 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 coil 79 and affecting the detection accuracy, and is arranged so as to block between the motor 11 and the coil 79. .

  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 Accordingly, the lubricating oil supplied from the lubricating oil supply passage 20c of the motor side case 20 through the inflow hole 20k formed in the storage space 90 is used for the shield 30d of the ball bearing 30, the flange 80a of the stopper 80, and the magnetic shield. The ball bearing 30 can be effectively lubricated by being supplied to the first oil chamber 83 defined by 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 through the outflow hole 20l formed in the storage space 90.

  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 22a of the center shaft bearing support 22 through the inflow hole 22b formed in the storage space 90 is the flange 80a of the stopper 80, the magnetic shield 82, the center shaft 49, and The ball bearing 50 can be effectively lubricated by being supplied to the second oil chamber 85 defined by the seal member 84 disposed between the center shaft bearing supports 22. That is, the storage space 90 is partitioned into the first oil chamber 83 and the second oil chamber 85 by the resolver 76.

  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 resolver stator 91 and the magnetic shield 82 in this embodiment will be described.
As shown in FIGS. 7 and 9, the resolver stator 91 is arranged so as to surround the outer periphery of the resolver rotor 77. That is, the resolver stator 91 is formed by laminating a plurality of substantially circular annular magnetic plate materials having a substantially circular opening 92 through which the resolver rotor 77 is inserted. In addition, magnetic poles are formed on the annular inner peripheral portion 91a of the resolver stator 91 so as to function as a resolver. In addition, a plurality of through holes 93 are formed in the outer peripheral portion 91b of the resolver stator 91 along the circumferential direction to reduce the weight. Several places (three places in this embodiment) in the through holes 93 are used as bolt holes of the bolts 78 that fix the resolver stator 91 to the motor side case 20.

  As shown in FIGS. 8 and 9, the magnetic shield 82 disposed on the motor 11 side of the resolver stator 91 is formed of a substantially circular annular plate having the same outer shape as the resolver stator 91 in a front view. . The magnetic shield 82 is formed with a plurality of bolt holes 95 (three in this embodiment) through which the bolts 78 are inserted. Further, when the magnetic shield 82 is attached to the motor side case 82, a through hole 96 for passing a lubricating oil is formed at a position located below. Further, when the magnetic shield 82 is attached to the motor side case 82, a breathing air passage through-hole 97 is formed at a position located above. The through holes 96 and 97 are formed at the same phase as any of the through holes 93 formed in the resolver stator 91. When the resolver stator 91 and the magnetic shield 82 are attached to the motor side case 20, the first oil The chamber 83 and the second oil chamber 85 are configured to communicate with each other through through holes 93, 96, and 97. The magnetic shield 82 has an inner peripheral side extending toward the motor 11 so as to face the flange 80a of the stopper 80 in a side view (see FIG. 6).

  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. It is supplied toward 16f. Here, since the high pressure lubricating oil supply passage 16f is extended substantially linearly upward, the high pressure lubricating oil supply passage 16f is made short and simple to reduce the flow resistance of the lubricating oil. Drive load has been reduced. 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.

  Here, when the resolver stator 91 and the magnetic shield 82 were attached to the motor side case 20, the through holes 93 and 96 for passing the lubricating oil were formed at locations located below. Therefore, when the lubricating oil that has lubricated the bearings 30 and 50 gathers below the storage space 90, the first oil chamber 83 and the second oil chamber 85 are in communication with each other. The surface can be held substantially uniformly and the lubricating oil can be smoothly guided to the lubricating oil return passage 20d.

  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. That is, the stirring resistance of the lubricating oil by the rotor 26 can be reduced more effectively.

  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.

  Here, when the resolver stator 91 and the magnetic shield 82 were attached to the motor side case 20, the through holes 93 and 97 for passing the breathing air were formed at locations located above. Therefore, since the first oil chamber 83 and the second oil chamber 85 communicate with each other, the breathing air generated in each oil chamber 83, 85 can be smoothly guided to the breather passage 20g.

  In addition, 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. 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 supplied from the second breather chamber 87 through the breather pipe 88 to the atmosphere. Released.

As described above, the storage space 90 of the resolver 76 is divided into the first oil chamber 83 and the second oil chamber 85 with the resolver 76 interposed therebetween, the through hole 93 is formed in the resolver stator 91, and the through hole is formed in the magnetic shield 82. 97 is formed to allow the first oil chamber 83 and the second oil chamber 85 to communicate with each other, and the first and second oil chambers 83, 85 are connected to the motor side case 20, the motor center case 18, and the motor / mission case 16 wall portion The breather passages 20g, 20h, 20i, 18d, and 16j formed in the first and second breather chambers 86 are communicated with the first breather chamber 86 at the top of the mission storage chamber 75, and the first breather chamber 86 is communicated with the second breather chamber 87 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 which are part of the mission storage chamber 75 are connected. It can be separated lubricating oil mist from breathing air generated in the receiving space 90 of the resolver 76 at 6,87. Similarly, the electric motor storage chamber 74 and the mission storage chamber 75 are communicated with the first and second breather chambers 86 and 87, so that the electric motor storage chamber 74, the mission storage chamber 75, and the resolver 76 have storage spaces 90 respectively. Compared with the case where a breather device is provided, the structure of the breather device can be simplified.
The breathing air generated in the electric motor storage chamber 74 and the storage space 90 of the resolver 76 is easily misted with lubricating oil. However, the breather passage 18d passes through the wall 18f of the motor center case 18 in the radial direction of the water jacket 55. Because it is formed outside, the breathing air can be efficiently exchanged heat with the refrigerant of the water jacket 55, and the lubricating oil mist can be effectively separated from the breathing air to prevent mist formation. 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 exclusively for the lubricating oil in the motor center case 18 or the like. In addition, since the lubricating oil passage is formed in the wall portion 18f of the motor center case 18, and the storage space 90 of the resolver 76 is configured as a part of the lubricating oil passage, the lubricating oil is placed outside the conventional motor housing. Compared with the case where the communication pipe is provided, the increase in the size of the vehicle drive motor unit 10 can be suppressed.
Further, 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.

  Furthermore, by forming a magnetic pole on the inner peripheral portion 91a of the resolver stator 91, the function as a resolver can be reliably achieved. Further, by providing the through hole 93 in the outer peripheral portion 91b of the resolver stator 91, it is possible to contribute to the weight reduction of the vehicle drive motor unit 10, and to prevent the lubricant oil from staying in the storage space 90 of the resolver 76. can do. Further, by supplying the lubricating oil to the storage space 90 of the resolver 76, the lubrication performance of the bearings 30 and 50 disposed so as to face the storage space 90 of the resolver 76 can be reliably ensured. Since the lubricating oil return passage 20d is formed so that the lubricating oil flows out from the storage space 90 of the resolver 76, the detection accuracy of the resolver 76 can be improved without the resolver 76 being immersed in oil. As a result, the lubricating oil pump 61 can be downsized and the response reliability of the motor 11 with respect to the torque command value can be improved.

  Further, a right chamber 74 a and a left chamber 74 b are formed on both sides of the motor 11 stored in the motor center case 18, respectively, and first oil chambers 83, respectively on both sides of the resolver 76 stored in the storage space 90. Although the second oil chamber 85 is formed, it is necessary to smoothly circulate the lubricating oil and adjust the oil surface height communicating with each space, but by forming the breather passage, It becomes easy to make the pressure difference in the space substantially uniform.

  Further, by providing a plurality of through holes 93 of the resolver stator 91, the vehicle drive motor unit 10 can be further reduced in weight.

  Further, the lubricating oil inflow holes 20k and 22b are provided above the storage space 90, and the lubricating oil outflow hole 20l is provided below the storage space 90 so that the lubricating oil can smoothly pass through the storage space 90. It is possible to prevent the lubricating oil from staying in the storage space 90 of the resolver 76.

  Further, the through holes 93 and 97 formed above the rotor shaft 31 can function as breather through holes. That is, the breathing air in the storage space 90 (the first oil chamber 83 and the second oil chamber 85) partitioned by the resolver 76 can be smoothly guided to the breather passage 20g. Further, the through holes 93 and 97 formed on the upper side are also used as a passage route for the lubricating oil, and the lubricating oil can be supplied to the bearings 30 and 50 more reliably.

  Further, by providing the magnetic shield 82, electromagnetic noise from the motor 11 side can be removed from the resolver 76, and the detection accuracy of the resolver 76 can be improved. Further, by forming the through holes 96 and 97 in the magnetic shield 82, it can function as an oil passage or a breather passage.

  Further, by making the outer shape of the resolver stator 91 substantially circular, toughness against electromagnetic noise generated from the motor 11 side can be improved, and the angle detection error of the resolver 76 can be reduced.

  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.

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. It is a front view of the resolver stator in the embodiment of the present invention. It is a front view of the magnetic shield in the embodiment of the present invention. It is a front view when the resolver stator and magnetic shield in the embodiment of the present invention are attached to the motor side case.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Drive motor unit for vehicles 11 ... Motor 14a-14f ... Lubricating oil communication path (lubricating oil path) 16a-16i ... Lubricating oil communication path (lubricating oil path) 18 ... Motor center case (motor housing) 18a ... Lubricating oil supply Passage (lubricating oil passage) 18b ... lubricating oil return passage (lubricating oil passage) 18c ... lubricating oil communication hole (lubricating oil passage) 18f ... wall portion 20a-20f ... lubricating oil communicating passage (lubricating oil passage) 20g ... breather passage 20k Inflow hole 20l ... Outflow hole 22b ... Inflow hole 25 ... Stator (stator part) 26 ... Rotor (rotor part) 31 ... Rotor shaft 61 ... Lubricating oil pump 74 ... Electric motor storage chamber (internal space) 76 ... Resolver 82 ... Magnetic Shield (shield plate) 83 ... 1st oil chamber 85 ... 2nd oil chamber 90 ... Storage space 91 ... Resolve bathroom 91a ... inner circumferential portion 91b ... outer peripheral portion 93 ... through hole 96, 97 ... through hole (the plate penetration)

Claims (6)

A motor housing having a substantially cylindrical wall portion in which a rotor portion and a stator portion of the motor are accommodated;
A rotor shaft that is inserted into the rotor portion and supported rotatably with respect to the motor housing;
A resolver for detecting the rotational position of the rotor shaft;
A lubricating oil pump for supplying lubricating oil to the motor; a lubricating oil passage for circulating lubricating oil from the lubricating oil pump;
In a vehicle drive motor unit comprising: a breather passage that communicates the internal space of the motor housing and the storage space of the resolver with the external space;
The lubricating oil passage is formed so as to pass through a storage space of the resolver;
A magnetic pole is formed in the inner peripheral portion of the annular resolver stator of the resolver, and a through hole is formed in the outer peripheral portion of the resolver stator to communicate with both side spaces of the storage space partitioned by the resolver. A vehicle drive motor unit characterized by the above.   The vehicle drive motor unit according to claim 1, wherein a plurality of the through holes are formed. The through hole is formed below the rotor shaft when the resolver stator is attached to the motor housing,
An inflow hole connected to the lubricating oil passage is formed above the rotor shaft in the storage space, and
3. The vehicle drive motor unit according to claim 1, wherein an outflow hole connected to the lubricating oil passage is formed below the rotor shaft in the storage space. 4.   The vehicle drive motor unit according to any one of claims 1 to 3, wherein the through hole is formed above the rotor shaft when the resolver stator is attached to the motor housing.   5. The resolver according to claim 1, wherein a shield plate is provided on a side of the resolver on which the motor is disposed, and a plate through hole is formed in the shield plate at a position in phase with the through hole. The vehicle drive motor unit according to claim 1.   The vehicle drive motor unit according to any one of claims 1 to 5, wherein the resolver stator is formed in a ring shape having a substantially circular outer shape through which the rotor shaft can be inserted.

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