CN113346680A - Motor and driving device - Google Patents

Motor and driving device Download PDF

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Publication number
CN113346680A
CN113346680A CN202110190377.8A CN202110190377A CN113346680A CN 113346680 A CN113346680 A CN 113346680A CN 202110190377 A CN202110190377 A CN 202110190377A CN 113346680 A CN113346680 A CN 113346680A
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CN
China
Prior art keywords
stator
oil
motor
housing
guide member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110190377.8A
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Chinese (zh)
Inventor
三木孝广
内势英明
青野嘉之
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Nidec Corp
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Nidec Corp
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Filing date
Publication date
Application filed by Nidec Corp filed Critical Nidec Corp
Publication of CN113346680A publication Critical patent/CN113346680A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/14—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle
    • H02K9/16—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle wherein the cooling medium circulates through ducts or tubes within the casing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

One aspect of the motor of the present invention includes: a rotor rotating around a motor shaft; a stator opposed to the rotor with a gap in a radial direction; a housing having a stator housing chamber housing the stator and a supply path through which a refrigerant for cooling the stator passes; and a guide member disposed in an opening portion of the supply passage that opens into the stator housing chamber and guiding a flow of the refrigerant. The guide member has a receiving port for receiving the refrigerant from the opening portion and a discharge port for discharging the refrigerant to the stator housing chamber.

Description

Motor and driving device
Technical Field
The invention relates to a motor and a driving device.
Background
As a conventional motor, a structure is known in which a stator is cooled by oil. In the rotating electric machine of patent document 1, the oil jet port opens in the peripheral wall of the housing. The oil jet overlaps with the coil end of the stator when viewed in the radial direction. The coil end is cooled by oil ejected from the oil jet.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2013-172486
Disclosure of Invention
Problems to be solved by the invention
For example, the opening for supplying the refrigerant to the stator housing chamber may be arranged at a position deviated from a position directly above the stator or the like due to a restriction in layout or the like. In such a case, the refrigerant cannot be stably supplied to the stator or the like. Further, when the opening portion is disposed directly above the stator or the like, there is room for improvement in that the refrigerant is efficiently and stably supplied to the stator or the like over a wide range, for example.
In view of the above, an object of the present invention is to provide a motor and a driving device capable of stably supplying a refrigerant to a stator or the like.
Means for solving the problems
One aspect of the motor of the present invention includes: a rotor that rotates about a motor shaft; a stator facing the rotor with a gap in a radial direction; a housing having a stator housing chamber housing the stator and a supply path through which a refrigerant for cooling the stator passes; and a guide member that is disposed in an opening portion of the supply passage that opens into the stator housing chamber, and that guides the flow of the refrigerant. The guide member has a receiving opening for receiving the refrigerant from the opening portion and a discharge opening for discharging the refrigerant to the stator housing chamber.
One aspect of the driving device of the present invention includes: the above-mentioned motor; and a transmission device connected to the motor, wherein the drive device is mounted on a vehicle.
The effects of the invention are as follows.
According to the motor and the driving device of one aspect of the present invention, the refrigerant can be stably supplied to the stator and the like.
Drawings
Fig. 1 is a schematic configuration diagram schematically showing a driving device of the first embodiment.
Fig. 2 is a perspective view showing a part of the motor of the first embodiment, and a part of a refrigerant supply port of the accumulator is omitted.
Fig. 3 is a cross-sectional view showing a part of the motor of the first embodiment in an enlarged manner, and the illustration of the plug member is omitted.
Fig. 4 is a perspective view showing the guide member.
Fig. 5 is a perspective view showing a modification of the reservoir.
Fig. 6 is a schematic configuration diagram schematically showing a driving device of the second embodiment.
Fig. 7 is a plan view showing the stator, a part of the supply passage, the guide member, and the plug member.
Fig. 8 is a plan view showing a modification of the stator, a part of the supply passage, the guide member, and the plug member.
Fig. 9 is a sectional view showing a guide member according to a first modification.
Fig. 10 is a plan view showing a guide member according to a first modification.
Fig. 11 is a perspective view showing a guide member of a second modification.
Fig. 12 is a plan view showing a guide member according to a second modification.
Fig. 13 is a perspective view showing a guide member of a third modification.
Fig. 14 is a sectional view showing a guide member of a third modification.
Fig. 15 is a perspective view showing a guide member of a fourth modification.
Fig. 16 is a sectional view showing a guide member according to a fourth modification.
Fig. 17 is a perspective view showing a guide member of a fifth modification.
Fig. 18 is a sectional view showing a guide member of a fifth modification.
Fig. 19 is a perspective view showing a guide member of a sixth modification.
Fig. 20 is a sectional view showing a guide member of a sixth modification.
In the figure:
1. 100-drive means, 2, 200-motor, 3-transmission means, 6-housing, 10-reservoir, 20-rotor, 30-stator, 81E-through hole, 77A, 77B, 77C, 77D, 77E, 77F-guide member, 78-guide tube, 78 a-peripheral wall, 78B-bottom wall, 78C-receiving port, 78D-discharge port, 78E-inclined surface, 78 g-tapered hole, 78 h-mist generating hole, 79-plug member, 81B-top wall (housing wall), 83-stator housing chamber, 92C-supply path, 92D-opening, 96-pump, 97-cooler, C-center shaft, J1-motor shaft.
Detailed Description
< first embodiment >
In the following description, the vertical direction will be defined based on the positional relationship when the driving device 1 and the motor 2 of the embodiment shown in the drawings are mounted on a vehicle on a horizontal road surface not shown. In the drawings, an XYZ coordinate system is shown as a three-dimensional orthogonal coordinate system as appropriate. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The + Z side is the upper side in the vertical direction, and the-Z side is the lower side in the vertical direction. In the present embodiment, the vertical upper side is simply referred to as "upper side", and the vertical lower side is simply referred to as "lower side". The X-axis direction is a direction orthogonal to the Z-axis direction and is a front-rear direction of the vehicle on which the drive device 1 is mounted. In the following embodiments, the + X side is the front side of the vehicle and the-X side is the rear side of the vehicle. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and is a vehicle width direction, which is a lateral direction of the vehicle. In the following embodiments, the + Y side is the left side of the vehicle and the-Y side is the right side of the vehicle. In the present embodiment, the right side corresponds to one axial side, and the left side corresponds to the other axial side. The front-back direction and the left-right direction are horizontal directions orthogonal to the vertical direction.
The positional relationship in the front-rear direction is not limited to that of the present embodiment, and the + X side may be the rear side of the vehicle, and the-X side may be the front side of the vehicle. In this case, the + Y side is the right side of the vehicle and the-Y side is the left side of the vehicle.
The motor shaft J1 shown in the figures as appropriate extends in the Y-axis direction, i.e., the left-right direction of the vehicle. That is, the motor shaft J1 extends in the horizontal direction. In the present embodiment, unless otherwise specified, the direction parallel to the motor shaft J1 is simply referred to as the "axial direction", the radial direction about the motor shaft J1 is simply referred to as the "radial direction", and the circumferential direction about the motor shaft J1, that is, the direction around the motor shaft J1 is simply referred to as the "circumferential direction". In the present specification, the "parallel direction" also includes a substantially parallel direction, and the "orthogonal direction" also includes a substantially orthogonal direction.
A drive device 1 of the present embodiment shown in fig. 1 is mounted on a vehicle having a motor as a power source, such as a Hybrid Electric Vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an Electric Vehicle (EV), and is used as the power source. As shown in fig. 1, the drive device 1 includes a motor 2, a transmission device 3 including a reduction gear 4 and a differential device 5, a case 6, and an inverter unit 8.
The housing 6 has a motor housing 81, a gear housing 82, and a partition 61 c. The motor housing 81 is a portion that houses the rotor 20 and the stator 30 described below in the casing 6. In the present embodiment, the internal space of the motor housing portion 81, that is, the chamber defined by the motor housing portion 81 and the partition wall 61c may be referred to as a stator housing chamber 83. That is, the housing 6 has a stator housing chamber 83. The stator housing chamber 83 houses the stator 30.
The gear housing 82 is a portion that houses the transmission device 3 inside the housing 6. The gear housing 82 is located on the left side of the motor housing 81. The bottom 81a of the motor housing 81 is located above the bottom 82a of the gear housing 82. The partition wall 61c axially partitions the inside of the motor housing portion 81 and the inside of the gear housing portion 82. The partition 61c is provided with a partition opening 68. The partition wall opening 68 connects the inside of the motor housing 81 and the inside of the gear housing 82.
The oil O, which is the refrigerant of the present embodiment, is stored in the motor storage portion 81 and the gear storage portion 82. An oil accumulation portion P for accumulating the oil O is provided in a lower region inside the gear housing portion 82. The oil O in the oil reservoir P is sent to the inside of the motor housing 81 through an oil passage 90 described below. The oil O sent to the inside of the motor housing 81 is accumulated in a lower region of the inside of the motor housing 81. At least a part of the oil O accumulated in the motor housing 81 moves to the gear housing 82 through the partition opening 68 and returns to the oil accumulation portion P.
In the present specification, the phrase "oil is contained in a certain portion" means that the oil is contained in the certain portion at least during a part of the time when the motor is being driven, and the oil may not be contained in the certain portion when the motor is stopped. For example, in the present embodiment, the oil O is stored in the motor storage 81, and the oil O may be located in the motor storage 81 during at least a part of the time when the motor 2 is being driven, and when the motor 2 is stopped, the oil O in the motor storage 81 may be entirely moved to the gear storage 82 through the partition opening 68. A part of the oil O fed from the oil passage 90 described below to the inside of the motor housing portion 81 may remain inside the motor housing portion 81 in a state where the motor 2 is stopped.
The oil O circulates in an oil passage 90 described below. The oil O is used to lubricate the reduction gear 4 and the differential gear 5. And, the oil O is used to cool the motor 2. As the oil O, in order to function as a lubricating oil and a cooling oil, it is preferable to use an oil equivalent to an Automatic Transmission lubricating oil (ATF) having a low viscosity.
In the present embodiment, the motor 2 is an inner rotor type motor. The motor 2 includes a rotor 20, a stator 30, a housing 6 having a motor housing 81, bearings 26 and 27, a cooler 97, a pump 96, a reservoir 10, a guide member 77, and a plug member 79. The rotor 20 rotates about a motor shaft J1. The rotor 20 has a rotation shaft 21 and a rotor main body 24. The torque of the rotor 20 is transmitted to the transmission device 3.
The rotary shaft 21 extends in the axial direction around the motor shaft J1. The rotary shaft 21 rotates about the motor shaft J1. The rotating shaft 21 is a hollow rotating shaft having a hollow portion 22 provided therein. The rotary shaft 21 is provided with a communication hole 23. The communication hole 23 extends in the radial direction and connects the hollow portion 22 and the outside of the rotary shaft 21.
The rotary shaft 21 extends across the motor housing 81 and the gear housing 82 of the housing 6. The left end of the rotary shaft 21 protrudes into the gear housing 82. A first gear 41 of the transmission device 3 described below is fixed to the left end of the rotary shaft 21. The rotary shaft 21 is rotatably supported by bearings 26 and 27.
The rotor body 24 is cylindrical and extends in the axial direction. The rotor body 24 is fixed to the outer peripheral surface of the rotating shaft 21. Although not shown, the rotor body 24 includes a rotor core and a rotor magnet fixed to the rotor core.
The stator 30 is radially opposed to the rotor 20 with a gap therebetween. The stator 30 is located radially outward of the rotor 20. The stator 30 has a stator core 32 and a coil assembly 33. The stator core 32 is fixed to the inner circumferential surface of the motor housing 81. As shown in fig. 2, the stator core 32 has a stator core main body 32a and a fixing portion 32 b. Although not shown, the stator core main body 32a has a cylindrical core back portion extending in the axial direction and a plurality of teeth extending radially inward from the core back portion.
The fixing portion 32b protrudes radially outward from the outer peripheral surface of the stator core main body 32 a. The fixing portion 32b is a portion of the stator core 32 fixed to the motor housing 81. The plurality of fixing portions 32b are provided at intervals in the circumferential direction. One of the fixing portions 32b protrudes upward from the stator core main body 32 a. The fixing portion 32b has a through hole 32c that penetrates the fixing portion 32b in the axial direction. Although not shown, the stator 30 is fixed to the housing 6 by screwing a screw inserted through the through hole 32c into the motor housing 81.
As shown in fig. 1, the coil assembly 33 has a plurality of coils 31 attached to the stator core 32 in the circumferential direction. The plurality of coils 31 are attached to the respective teeth of the stator core 32 via insulators not shown. The plurality of coils 31 are arranged in the circumferential direction. More specifically, the plurality of coils 31 are arranged at equal intervals in the circumferential direction over one circumference. Although not shown, the coil assembly 33 may include a binding member or the like for binding the coils 31, or may include a crossover wire for connecting the coils 31 to each other.
The coil block 33 has coil ends 33a, 33b projecting from the stator core 32 in the axial direction. The coil end 33a is a portion of the coil block 33 that protrudes rightward from the stator core 32. The coil end 33b is a portion of the coil block 33 that protrudes leftward from the stator core 32. The coil end 33a includes a portion of each coil 31 of the coil assembly 33 that protrudes to the right side of the stator core 32. The coil end 33b includes a portion of each coil 31 of the coil assembly 33 that protrudes to the left of the stator core 32. In the present embodiment, the coil ends 33a and 33b are annular around the motor shaft J1. Although not shown, the coil ends 33a and 33b may include a binding member or the like for binding the coils 31, or may include a crossover for connecting the coils 31 to each other.
The bearings 26, 27 rotatably support the rotor 20. The bearings 26, 27 are, for example, ball bearings. As shown in fig. 1, the bearing 26 is a bearing that rotatably supports a portion of the rotor 20 located on the right side of the stator core 32. In the present embodiment, the bearing 26 supports a portion of the rotary shaft 21 located on the right side of the portion where the rotor body 24 is fixed. The bearing 26 is held by a right wall portion 81c of the wall portion of the motor housing portion 81, which covers the right side of the rotor 20 and the stator 30.
The bearing 27 is a bearing that rotatably supports a portion of the rotor 20 located on the left side of the stator core 32. In the present embodiment, the bearing 27 supports a portion of the rotary shaft 21 located on the left side of the portion to which the rotor body 24 is fixed. The bearing 27 is held by the partition wall 61 c. The components of the motor 2 other than the above are described below.
The transmission device 3 is housed in the gear housing 82 of the housing 6. The transmission device 3 is connected to the motor 2. More specifically, the transmission device 3 is connected to the left end of the rotary shaft 21. The transmission device 3 has a reduction gear 4 and a differential device 5. The torque output from the motor 2 is transmitted to the differential device 5 via the reduction gear 4.
The reduction gear 4 is connected to the motor 2. The reduction device 4 reduces the rotation speed of the motor 2 and increases the torque output from the motor 2 according to the reduction ratio. The reduction gear 4 transmits the torque output from the motor 2 to the differential gear 5. The reduction gear 4 has a first gear 41, a second gear 42, a third gear 43, and an intermediate rotation shaft 45.
The first gear 41 is fixed to the outer peripheral surface of the left end of the rotary shaft 21. The first gear 41 rotates together with the rotary shaft 21 about the motor shaft J1. The intermediate rotating shaft 45 extends along an intermediate shaft J2 parallel to the motor shaft J1. The intermediate rotating shaft 45 rotates about the intermediate shaft J2. The second gear 42 and the third gear 43 are fixed to the outer peripheral surface of the intermediate rotating shaft 45. The second gear 42 and the third gear 43 are connected via an intermediate rotation shaft 45. The second gear 42 and the third gear 43 rotate about the intermediate shaft J2. The second gear 42 is meshed with the first gear 41. The third gear 43 meshes with a below-described ring gear 51 of the differential device 5.
The torque output from the motor 2 is transmitted to the ring gear 51 of the differential device 5 via the rotary shaft 21, the first gear 41, the second gear 42, the intermediate rotary shaft 45, and the third gear 43 in this order. The gear ratio of each gear, the number of gears, and the like can be variously changed according to a required reduction ratio. In the present embodiment, the reduction gear 4 is a parallel-axis gear type reduction gear in which the axes of the gears are arranged in parallel.
The differential device 5 is connected to the motor 2 via the reduction gear 4. The differential device 5 is a device for transmitting the torque output from the motor 2 to the wheels of the vehicle. When the vehicle turns, the differential device 5 absorbs a speed difference between the left and right wheels and transmits the same torque to the axles 55 of the left and right wheels. The differential device 5 includes a ring gear 51, a gear box not shown, a pair of pinion gears not shown, a pinion shaft not shown, and a pair of side gears not shown. The ring gear 51 rotates about a differential shaft J3 parallel to the motor shaft J1. The torque output from the motor 2 is transmitted to the ring gear 51 via the reduction gear 4.
An oil passage 90 through which oil O circulates is provided in the motor 2 and the casing 6. That is, the motor 2 is provided with an oil passage 90. The oil passage 90 is a path of the oil O that supplies the oil O from the oil accumulation portion P to the motor 2 and guides the oil O to the oil accumulation portion P again. The oil passage 90 is provided across the inside of the motor housing 81 and the inside of the gear housing 82.
In addition, in this specification, "oil passage" refers to a path of oil. Therefore, the "oil passage" is a concept including not only a "flow passage" that forms a stable oil flow in one direction, but also a path that temporarily retains oil and a path through which oil drops. The path for temporarily retaining oil includes, for example, a reservoir for storing oil. The oil passage 90 is a passage through which oil O serving as the refrigerant of the present embodiment passes, and may be referred to as a refrigerant passage instead.
The oil passage 90 has a first oil passage 91 and a second oil passage 92. The first oil passage 91 and the second oil passage 92 circulate oil O inside the casing 6. The first oil passage 91 has a lift path 91a, a rotary shaft supply path 91b, a rotary shaft inner path 91c, and a rotor inner path 91 d. A reservoir 93 is provided in the path of the first oil passage 91. The storage portion 93 is provided in the gear housing portion 82.
The lift path 91a is a path for lifting the oil O from the oil accumulation portion P by the rotation of the ring gear 51 of the differential device 5 and receiving the oil O in the reservoir portion 93. The reservoir 93 is open at the upper side and stores oil O. The reservoir 93 receives the oil O kicked up by the ring gear 51. Further, in a case where the liquid level of the oil reservoir P is high immediately after the motor 2 is driven, the reservoir 93 receives the oil O raised by the second gear 42 and the third gear 43 in addition to the ring gear 51.
The rotation shaft supply path 91b guides the oil O from the reservoir 93 to the hollow portion 22 of the rotation shaft 21. The rotation shaft inner path 91c is a path through which the oil O passes in the hollow portion 22 of the rotation shaft 21. The rotor inner path 91d is a path through which the oil O passes from the communication hole 23 of the rotary shaft 21 inside the rotor body 24 and scatters toward the stator 30.
In the rotation shaft inner path 91c, a centrifugal force is applied to the oil O inside the rotor 20 as the rotor 20 rotates. Thereby, the oil O continuously scatters from the rotor 20 to the outside in the radial direction. Then, the path inside the rotor 20 becomes a negative pressure with the scattering of the oil O, and the oil O stored in the reservoir 93 is sucked into the rotor 20, and the path inside the rotor 20 is filled with the oil O.
The oil O reaching the stator 30 extracts heat from the stator 30. The oil O after cooling the stator 30 drips downward and accumulates in the lower region in the motor housing 81. The oil O accumulated in the lower region of the motor housing 81 moves to the gear housing 82 through the partition opening 68 provided in the partition 61 c. As described above, the first oil passage 91 supplies the oil O to the rotor 20 and the stator 30.
In the second oil passage 92, the oil O is drawn up from the oil accumulation portion P to the upper side of the stator 30 and supplied to the stator 30. That is, the second oil passage 92 supplies the oil O to the stator 30 from the upper side of the stator 30. Second oil path 92 is provided with pump 96, cooler 97, and reservoir 10. The second oil passage 92 has a first flow passage 92a, a second flow passage 92b, and a supply passage 92 c.
The first flow path 92a, the second flow path 92b, and the supply path 92c are provided in a wall portion of the casing 6. That is, the housing 6 has the supply passage 92 c. The first flow path 92a connects the oil reservoir P and the pump 96. The second flow path 92b connects the pump 96 and the cooler 97.
The supply path 92c is provided in a wall portion of the motor housing portion 81. The oil O that cools the stator 30 passes through the supply passage 92 c. The supply passage 92c supplies the oil O to the reservoir 10. As shown in fig. 1 and 3, the supply passage 92c includes a supply passage upstream portion 92e and a supply passage downstream portion 92 f. In the present embodiment, the supply path upstream portion 92e is located at the front wall portion 81d among the wall portions of the motor housing portion 81. The supply path upstream portion 92e extends upward from the cooler 97. The supply passage downstream portion 92f is connected to the supply passage upstream portion 92e and is located downstream of the supply passage upstream portion 92 e. The supply path downstream portion 92f is located on the ceiling wall portion 81b among the wall portions of the motor housing portion 81. The supply passage downstream portion 92f is connected to the upper end of the supply passage upstream portion 92 e. In the present embodiment, the supply passage downstream portion 92f extends in the vertical direction. The supply passage downstream portion 92f extends downward from a connecting portion with the supply passage upstream portion 92 e. The lower end of the supply passage downstream portion 92f opens into the stator housing chamber 83.
In the present embodiment, the supply passage downstream portion 92f is constituted by a part of the through hole 81e that penetrates the ceiling wall portion 81b of the housing 6 in the vertical direction. That is, the housing 6 has a through hole 81e penetrating a wall portion of the housing 6. One end of the through hole 81e opens into the stator housing chamber 83, and the other end of the through hole 81e opens into the outer peripheral surface of the motor housing 81, that is, the outer peripheral surface of the housing 6. An opening 92d of the supply path 92c, which will be described later, is disposed in the through hole 81 e. The opening 92d is located at the lower end of the through hole 81 e.
As shown in fig. 1 to 3, the supply path 92c has an opening 92d located above the reservoir 10 and opening into the motor housing 81. The opening 92d is a portion of the supply passage 92c that opens into the stator housing chamber 83. That is, one end of the supply passage 92c opens into the stator housing chamber 83 through the opening 92d, and the other end of the supply passage 92c is connected to the pump 96 via the cooler 97. The opening 92d constitutes a part of the supply passage downstream portion 92 f. The opening 92d is disposed at the lower end of the supply passage downstream portion 92 f. The opening 92d supplies the oil O to the inside of the motor housing 81. According to the present embodiment, the cooled oil O can be discharged from the supply passage 92c to the stator housing chamber 83 by the pump 96 and the cooler 97. The cooling efficiency of the stator 30 and the like is improved.
The opening 92d partially overlaps the reservoir 10 when viewed from above. At least a part of the opening 92d faces the reservoir 10. Specifically, at least a part of the opening 92d faces the first flow path portion 11 of the reservoir 10 described below.
The pump 96 is an electric pump driven by electric power. As shown in fig. 1, the pump 96 is connected to the cooler 97, and delivers the oil O to the cooler 97. Specifically, the pump 96 sucks up the oil O from the oil sump P through the first flow path 92a, and supplies the oil O to the stator 30 and the like through the second flow path 92b, the cooler 97, the supply path 92c, and the accumulator 10.
Cooler 97 cools oil O passing through second oil passage 92. The cooler 97 cools the oil O, and is connected to the second flow path 92b and the supply path 92 c. The second flow path 92b and the supply path 92c are connected via an internal flow path of the cooler 97. A cooling water pipe 97j through which cooling water cooled by a radiator not shown passes is connected to the cooler 97. The oil O passing through the cooler 97 exchanges heat with the cooling water passing through the cooling water pipe 97j, and is cooled. Further, an inverter unit 8 is provided in a path of the cooling water pipe 97 j. The cooling water passing through the cooling water pipe 97j cools the inverter unit 8.
The reservoir 10 constitutes a part of the second oil passage 92. The reservoir 10 is located inside the motor housing 81. That is, the reservoir 10 is disposed in the stator housing chamber 83. The reservoir 10 is located above the stator 30 and has a gutter shape for storing the oil O. As shown in fig. 2, the reservoir 10 is supported from the lower side by the stator 30 and is provided to the motor 2. The reservoir 10 has a resin portion.
In the following description, a direction from both end portions of the stator 30 toward the center in the axial direction may be referred to as "axially inner side", and a direction from the center of the stator 30 toward both end portions in the axial direction may be referred to as "axially outer side".
The reservoir 10 is formed in a gutter shape extending in a substantially rectangular frame shape when viewed from the vertical direction, and oil O flows therethrough. In the present embodiment, the reservoir 10 stores the oil O supplied into the motor housing portion 81 through the supply passage 92 c. Since the reservoir 10 has a gutter-like shape with an open upper side, the oil O can be supplied to the reservoir 10 by flowing the oil O out of the opening 92d on the upper side of the reservoir 10.
As shown in fig. 2 and 3, the reservoir 10 has a flow path 9 through which the oil O flows. The accumulator 10 has a wall portion 70 constituting the flow path 9, a refrigerant receiving port 76, a refrigerant supply port 17, an accumulator first fixed portion 19A, an accumulator second fixed portion 19B, and a support rib 16. Wall portion 70 includes bottom wall portion 71, side wall portion 72, flange portion 73, top wall portion 74, and protruding portion 75. That is, the reservoir 10 has a bottom wall portion 71, a side wall portion 72, a flange portion 73, a top wall portion 74, and a protruding portion 75. The refrigerant receiving port 76 receives oil O from the supply passage 92 c. Specifically, the refrigerant receiving port 76 receives the oil O from the opening 92d via the guide member 77. The refrigerant receiving port 76 is disposed in the first flow path portion 11 of the flow path 9, which will be described below. The refrigerant supply port 17 penetrates a bottom wall portion 71 as a part of the wall portion 70 in the vertical direction. The refrigerant supply port 17 is a hole for supplying oil O from the accumulator 10 to the stator 30 and the like. The stator 30 and the like described in the present embodiment include the stator 30, bearings 26 and 27, and a thermistor not shown. By supplying the oil O, the stator 30 is cooled and the bearings 26 and 27 are lubricated, thereby maintaining the function of the thermistor satisfactorily. A plurality of refrigerant supply ports 17 are provided. The plurality of refrigerant supply ports 17 are disposed in the flow path 9 in a distributed manner. The refrigerant supply ports 17 are disposed in the first channel portion 11, the second channel portions 12A, 12B, the first corner channel portions 14A, 14B, the third channel portion 13, the second corner channel portions 15A, 15B, and the bearing supply portions 18A, 18B, respectively, which will be described below. In fig. 2, a part of the refrigerant supply port 17 is not shown.
As shown in fig. 2, the reservoir 10 has, when viewed from above: a first flow path portion 11 extending in a predetermined direction; second flow path portions 12A, 12B extending in a direction different from the predetermined direction; first corner channel parts 14A, 14B connecting the first channel part 11 and the second channel parts 12A, 12B; a third flow path portion 13 which is disposed at an interval from the first flow path portion 11 in a direction orthogonal to the predetermined direction and extends in the predetermined direction; second corner channel parts 15A, 15B connecting the second channel parts 12A, 12B and the third channel part 13; and bearing supply portions 18A, 18B. That is, the flow channel 9 includes a first flow channel portion 11, second flow channel portions 12A and 12B, first corner flow channel portions 14A and 14B, a third flow channel portion 13, second corner flow channel portions 15A and 15B, and bearing supply portions 18A and 18B. In the present embodiment, the predetermined direction corresponds to the axial direction. In the present embodiment, a direction orthogonal to a direction in which a part of the flow channel 9 extends when the reservoir 10 is viewed from above is defined as "a width direction of the flow channel". Further, a part of the flow path 9 is, for example, any one of the above-described flow path sections 11, 12A, 12B, 14A, 14B, 13, 15A, 15B, and the like.
As shown in fig. 2 and 3, the bottom wall portion 71 has a plate shape, and the pair of plate surfaces face in the vertical direction. The side wall portion 72 has a plate shape, and a pair of plate surfaces face in the horizontal direction. The side wall portion 72 protrudes upward from the bottom wall portion 71. The side wall portions 72 are provided in a pair. The pair of side walls 72 are disposed at intervals in the width direction of the flow path 9. The top wall portion 74 is connected to the side wall portion 72 and faces the bottom wall portion 71 with a space from above. In the present embodiment, the top wall portion 74 is connected to the upper end portion of the side wall portion 72. The top wall 74 is disposed opposite to at least a part of the bottom wall 71 from above. In the present embodiment, the top wall portion 74 overlaps with a portion of the bottom wall portion 71 located on the front side of the motor shaft J1 when viewed from above. According to the present embodiment, since the reservoir 10 has the top wall portion 74, the top wall portion 74 prevents the oil O supplied to the reservoir 10 from overflowing to the outside of the reservoir 10 beyond the side wall portion 72 on the upper side. According to the drive device 1 of the present embodiment, even when the motor 2 is inclined while the vehicle is located on a slope or the like, for example, the top wall portion 74 prevents the oil O from overflowing from the reservoir 10.
The refrigerant-receiving port 76 has a portion opened at the top wall portion 74. According to the present embodiment, since the refrigerant receiving port 76 is open in the top wall portion 74, the oil O in the accumulator 10 can be prevented from leaking from the refrigerant receiving port 76 to the outside of the accumulator 10. The oil O can be stably supplied from the refrigerant supply port 17 of the accumulator 10 to the stator 30 and the like, and the stator 30 and the like can be stably cooled. In the present embodiment, the refrigerant receiving port 76 has a portion that opens to the top wall portion 74 and a portion that opens to the side wall portion 72. Since the opening area of the refrigerant receiving port 76 is ensured to be large, the oil O is easily received.
The flange 73 has a plate shape, and the pair of plate surfaces face in the vertical direction. The flange portion 73 is connected to the lower end of the side wall portion 72. A pair of flange portions 73 is provided. The pair of flange portions 73 are connected to lower end portions of the pair of side wall portions 72. The flange portion 73 extends from the lower end portion of the side wall portion 72 in the width direction of the flow path 9 in a direction away from the flow path 9. The lower plate surface of the flange 73 contacts the upper surface of the bottom wall 71. Flange 73 and bottom wall 71 are fixed to each other. Specifically, the flange portion 73 and the bottom wall portion 71 are fixed to each other by, for example, ultrasonic welding, an adhesive, a screw, a snap structure, or the like. According to the present embodiment, the side wall portion 72 and the bottom wall portion 71 are stably fixed by the flange portion 73. The flange 73 prevents oil O from leaking out of the reservoir 10 from between the side wall 72 and the bottom wall 71.
The first flow path portion 11 extends linearly in the axial direction when viewed from above. The first flow path portion 11 is located on the front side of the motor shaft J1. The first flow path portion 11 is disposed at a position further toward the front side than the upper fixing portion 32b of the stator core 32.
The first channel portion 11 is located below the opening 92 d. Thereby, the first flow path portion 11 receives the oil O supplied from the opening portion 92d into the motor housing portion 81. In the present embodiment, the opening 92d is disposed at a position separated inward in the axial direction from the end portions on both sides in the axial direction of the first flow path portion 11. The opening 92d overlaps the left side portion of the first channel portion 11 when viewed from above. In the present embodiment, the rear end of the opening 92d overlaps the first channel portion 11 when viewed from above.
As shown in fig. 2, the first corner flow path portions 14A and 14B are provided in a pair at a distance from each other in a predetermined direction. The pair of first corner flow path portions 14A and 14B are connected to both ends of the first flow path portion 11 in the predetermined direction. The first corner channel portion 14A is located on the right side of the first channel portion 11, and is connected to the right end of the first channel portion 11. The first corner channel portion 14B is located on the left side of the first channel portion 11, and is connected to the left end of the first channel portion 11. When viewed from above, the distance between the first corner flow path portion 14A and the opening 92d is larger than the distance between the first corner flow path portion 14B and the opening 92 d.
The first corner flow path portions 14A and 14B extend in a curved shape when viewed from above. The first microchannel portion 14A is located rearward from the right end of the first microchannel portion 11 toward the right, i.e., axially outward. The first diagonal flow path portion 14B is located rearward from the left end of the first diagonal flow path portion 11 toward the left, i.e., axially outward. The first angular flow path portions 14A and 14B are located on the front side of the motor shaft J1. The first angular flow path portions 14A and 14B are disposed at positions further to the front side than the upper fixing portion 32B of the stator core 32. The first angular flow path portions 14A and 14B protrude axially outward from the stator core 32. The dimension in the width direction of the flow path of the first corner flow path portions 14A and 14B is equal to or larger than the dimension in the width direction of the flow path of the first flow path portion 11. According to the present embodiment, the pressure loss of the oil O flowing from the first flow path portion 11 to the first corner flow path portions 14A and 14B can be suppressed to be small.
A pair of the second channel portions 12A and 12B are provided at intervals in a predetermined direction. The pair of second channel portions 12A and 12B are connected to the pair of first corner channel portions 14A and 14B. The second channel portion 12A is connected to the rear end of the first corner channel portion 14A located on the right side of the pair of first corner channel portions 14A and 14B. The second channel portion 12B is connected to the rear end of the first angled channel portion 14B located on the left side of the pair of first angled channel portions 14A, 14B. The second channel portions 12A, 12B extend linearly in a direction orthogonal to the axial direction when viewed from above.
The second channel portion 12A is located above the coil end portion 33 a. The second channel portion 12A overlaps the coil end portion 33a when viewed from above. The second flow path portion 12A is located on the right side of the stator core 32. The second channel portion 12B is located above the coil end portion 33B. The second channel portion 12B overlaps the coil end portion 33B when viewed from above. The second flow path portion 12B is located on the left side of the stator core 32. In the present embodiment, the flow channel 9 of the reservoir 10 includes a first flow channel portion 11, a pair of first corner flow channel portions 14A and 14B, and a pair of second flow channel portions 12A and 12B. That is, the reservoir 10 has a flow path portion having at least a U shape in a plan view. Specifically, in the present embodiment, the reservoir 10 has a flow path shape having a rectangular frame shape in a plan view. The flow path 9 of the reservoir 10 can be easily disposed above the stator core 32 and the pair of coil ends 33a and 33b, and the stator 30 and the like can be cooled in a wide range and efficiently.
The second angular flow path portions 15A and 15B are provided in a pair spaced from each other in a predetermined direction. The pair of second corner flow path portions 15A and 15B are connected to the pair of second flow path portions 12A and 12B. The second corner flow path portion 15A is connected to the rear end of the second flow path portion 12A located on the right side of the pair of second flow path portions 12A and 12B. The second corner flow path portion 15B is connected to the rear end portion of the second flow path portion 12B located on the left side of the pair of second flow path portions 12A and 12B. The second corner flow path portions 15A and 15B are curved or bent when viewed from above. The second angular flow path portion 15A is located on the left side, i.e., axially inward from the rear end of the second flow path portion 12A toward the rear. The second angular flow path portion 15B is located on the right side, i.e., axially inward from the rear end of the second flow path portion 12B toward the rear. The second angular flow path portions 15A and 15B are located on the rear side of the motor shaft J1. The second angular flow path portions 15A and 15B are disposed at positions further to the rear side than the upper fixing portion 32B of the stator core 32. The second angular flow path portions 15A and 15B are located axially outward of the stator core 32.
The third flow path portion 13 extends linearly in the axial direction when viewed from above. The third flow path portion 13 is located on the rear side of the motor shaft J1. The third flow path portion 13 is disposed at a position further to the rear side than the upper fixing portion 32b of the stator core 32. The right end of the third channel portion 13 is connected to the left and rear ends of the second angular channel portion 15A. The left end of the third flow path portion 13 is connected to the right and rear ends of the second angular flow path portion 15B. In the present embodiment, the channel 9 of the reservoir 10 includes the first channel portion 11, the first corner channel portion 14A, the second channel portion 12A, the second corner channel portion 15A, and the third channel portion 13. The channel 9 includes a first channel portion 11, a first corner channel portion 14B, a second channel portion 12B, a second corner channel portion 15B, and a third channel portion 13. That is, the reservoir 10 has a flow path portion having at least a U shape in a plan view. Specifically, in the present embodiment, the reservoir 10 has a flow path shape having a rectangular frame shape in a plan view. The oil O can be supplied from the flow path 9 of the reservoir 10 to the stator 30 and the like over a wide range, and the cooling efficiency of the stator 30 and the like can be improved.
The bearing supply portions 18A, 18B project axially outward from the second flow path portions 12A, 12B. The bearing supply portion 18A protrudes rightward from the second channel portion 12A and is connected to the second channel portion 12A. The bearing supply portion 18A extends in a direction orthogonal to the axial direction when viewed from above. The bearing supply portion 18A is located above the bearing 26. The bearing supply portion 18A overlaps the bearing 26 when viewed from above. The bearing supply portion 18B protrudes leftward from the second channel portion 12B, and is connected to the second channel portion 12B. The bearing supply portion 18B extends in a direction orthogonal to the axial direction when viewed from above. The bearing supply portion 18B is located above the bearing 27. The bearing supply portion 18B overlaps the bearing 27 when viewed from above.
The protrusion 75 is disposed in any one of the first channel portion 11, the second channel portions 12A and 12B, and the first corner channel portions 14A and 14B, and protrudes in the vertical direction in the channel 9. The protrusion 75 is, for example, rib-shaped or protrusion-shaped, and in the present embodiment, rib-shaped. The protrusion 75 protrudes from at least one of the bottom wall 71 and the top wall 74 in the flow path 9. The protrusion 75 has a function of guiding the flow of the oil O flowing through the flow path 9. That is, the protrusion 75 has an effect of rectifying the oil O flowing through the flow path 9. Therefore, the protruding portion 75 may be referred to as a guide portion or a rectifying portion instead. The guide portion (flow straightening portion) is disposed in any one of the first flow path portion 11, the second flow path portions 12A and 12B, and the first corner flow path portions 14A and 14B, and guides the flow of the refrigerant, which is oil O.
According to the present embodiment, the protrusion 75, i.e., the guide portion (flow regulating portion), can suppress variation in the flow rate of the oil O flowing through each portion of the flow path 9 of the reservoir 10. That is, the flow rates of the oil O flowing through the respective portions of the flow path 9 can be equalized. This makes it possible to equalize the supply amount of the oil O supplied from the plurality of refrigerant supply ports 17 to the stator 30 and the like, for example, or to easily adjust the supply amount of the oil O for each target member to which the oil O is supplied.
In the present embodiment, the protruding portion 75 protrudes upward from the bottom wall portion 71 between the pair of side wall portions 72. Since the protrusion 75 protrudes upward from the bottom wall 71, the flow regulating action of the oil O flowing on the bottom wall 71 can be stably obtained by the protrusion 75. The protrusion 75 is disposed in the middle between both ends in the width direction of the flow path 9. That is, the protruding portion 75 is disposed at a position away from the pair of side wall portions 72 in the width direction of the flow path 9 in the inside of the flow path 9. According to the present embodiment, it is possible to suppress the protrusion 75 from blocking the flow of the oil O at the end in the width direction of the flow path 9. The oil O is easily distributed over the entire width of the flow path 9, and the flow rate of the oil O can be further suppressed from varying in each part of the flow path 9.
The protrusion 75 has a portion disposed at least in the first corner flow path portions 14A and 14B. According to the present embodiment, the protrusion 75 can further suppress the oil O flowing from the first channel portion 11 into the first corner channel portions 14A and 14B from flowing outside in the width direction of the channels of the first corner channel portions 14A and 14B, that is, outside the corners. This can suppress variations in the flow rate of the oil O flowing through the first corner flow path portions 14A and 14B and the second flow path portions 12A and 12B located on the downstream side thereof in the respective portions of the flow path 9.
The reservoir first fixing portion 19A is disposed in the third flow path portion 13. The reservoir first fixing portion 19A protrudes upward from the third flow path portion 13. In the present embodiment, the third flow path portion 13 is controlled in flow by the reservoir first fixing portion 19A at an intermediate portion between both end portions in the axial direction in the third flow path portion 13. That is, the third flow channel portion 13 has a flow channel portion located on one axial side of the reservoir first fixed portion 19A and a flow channel portion located on the other axial side of the reservoir first fixed portion 19A.
The first reservoir fixing portion 19A has a mounting hole 19A penetrating the first reservoir fixing portion 19A in the axial direction. Although not shown, a screw screwed into the motor housing 81 passes through the mounting hole 19 a. The reservoir first fixing portion 19A is fixed to the housing 6 with a screw member passing through the mounting hole 19A. Further, a cylindrical metal member extending in the axial direction may be embedded in the mounting hole 19 a. In this case, the screw that fixes the reservoir first fixing portion 19A passes through the metal member.
The reservoir second fixing portion 19B is disposed in the second flow path portion 12A. The reservoir second fixing portion 19B protrudes upward from the second channel portion 12A. Specifically, the reservoir second fixing portion 19B protrudes upward from a portion of the pair of side wall portions 72 located on the inner side in the axial direction of the second flow path portion 12A. The second reservoir fixing portion 19B has a plate shape with a plate surface facing in the axial direction.
The reservoir second fixing portion 19B has a recess 19B. The concave portion 19B is recessed downward from the upper end of the second reservoir fixing portion 19B. The recess 19B penetrates the reservoir second fixing portion 19B in the axial direction. The inner edge of the recess 19b has an arc shape extending around the central axis of the recess 19 b. The inner edge portion of the recess 19b extends over 180 ° around the central axis of the recess 19 b. The recess 19b overlaps the through hole 32c of the upper fixing portion 32b of the stator core main body 32a when viewed from the axial direction. The screw for fixing the stator core 32 to the motor housing 81 passes through the recess 19b and the through hole 32c from the right side. The stator core 32 and the second reservoir fixing portion 19B are fixed to the housing 6 by screws that pass through the recess 19B and the through-hole 32 c.
As shown in fig. 3, the support ribs 16 protrude downward from the bottom wall portion 71. The support ribs 16 are provided in plurality at intervals in the axial direction. The end surfaces of the support ribs 16 facing downward contact the outer peripheral surface of the stator core main body 32a from above. The reservoir 10 is supported from the lower side by the stator core 32 via the support ribs 16.
The guide member 77 is disposed between the housing 6 and the reservoir 10. The guide member 77 is positioned between the top wall portion 81b of the motor housing portion 81 and the bottom wall portion 71 of the reservoir 10 in the vertical direction. At least a portion of the guide member 77 overlaps the reservoir 10 when viewed from above. The guide member 77 is disposed in the opening 92d of the supply passage 92c and guides the flow of the oil O.
As shown in fig. 3, the guide member 77 is disposed at one end of the through hole 81 e. In the present embodiment, the guide member 77 is disposed at the lower end of the through hole 81 e. As shown in fig. 3 and 4, the guide member 77 includes a cylindrical guide cylinder 78. The guide cylinder 78 has a bottomed cylindrical shape. In the present embodiment, the center axis C of the guide cylinder 78 extends in the vertical direction. The guide tube 78 has a bottomed tubular shape with an open upper side and a closed lower side. The guide cylinder 78 has a peripheral wall 78a and a bottom wall 78 b. The peripheral wall 78a has a cylindrical shape extending in the vertical direction. The bottom wall 78b is plate-shaped with its plate surface facing in the vertical direction.
The peripheral wall 78a has a receiving opening 78c, an ejection opening 78d, and a locking projection 78 f. That is, the guide member 77 has a receiving opening 78c, a discharge opening 78d, and a locking projection 78 f. The receiving opening 78c penetrates the peripheral wall 78 a. The receiving opening 78c is disposed at a front portion of the peripheral wall 78 a. That is, the receiving opening 78c is open on the front side. The receiving opening 78C opens by cutting a front side portion of the peripheral wall 78a along the center axis C. The receiving opening 78c is disposed over substantially the entire area of the peripheral wall 78a in the vertical direction. The receiving port 78c receives the oil O from the opening 92d into the guide member 77.
The discharge port 78d penetrates the peripheral wall 78 a. That is, the ejection port 78d opens in the peripheral wall 78a of the guide cylinder 78. The discharge port 78d is disposed on the rear side of the peripheral wall 78 a. That is, the discharge port 78d is opened on the rear side. The ejection port 78d is open at a lower portion of the peripheral wall 78 a. In the present embodiment, the ejection port 78d has a square hole shape. In the present embodiment, the opening dimension of the ejection port 78d in the circumferential direction around the central axis C is larger than the opening dimension in the axial direction along the central axis C. The discharge port 78d discharges the oil O to the stator housing chamber 83. In the present embodiment, the guide member 77 is attached to the opening 92d of the supply passage 92c that opens into the stator housing chamber 83, whereby the discharge direction of the oil O can be easily changed to a desired direction. Therefore, the degree of freedom such as the direction of the oil O discharged through the guide member 77 is improved. According to the present embodiment, the oil O can be stably supplied to the stator 30 and the like, and the stator 30 and the like can be efficiently cooled.
The discharge port 78d discharges the oil O toward the reservoir 10. The guide member 77 supplies the oil O to the stator 30 via the reservoir 10. According to the present embodiment, the oil O can be supplied from the guide member 77 to the stator 30 and the like over a wide range via the reservoir 10. The cooling efficiency of the stator 30 and the like is improved.
As shown in fig. 4, the locking projection 78f projects outward in a radial direction perpendicular to the central axis C from a lower portion of the peripheral wall 78 a. The locking projection 78f projects rearward from the peripheral wall 78 a. In the present embodiment, the locking projection 78f has a rib shape extending in the axial direction of the center axis C. A pair of locking projections 78f are provided. The pair of locking projections 78f are disposed on both sides of the discharge port 78d in the circumferential direction around the center axis C.
As shown in fig. 3, the bottom wall 78b has an inclined surface 78 e. The inclined surface 78e is inclined with respect to an unillustrated virtual plane that extends in a direction perpendicular to the central axis C of the guide cylinder 78. In the present embodiment, the inclined surface 78e faces upward and is inclined with respect to the horizontal direction. The inclined surface 78e is planar. The inclined surface 78e is disposed substantially over the entire area of the bottom wall 78 b. The inclined surface 78e is located on the lower side as it faces the rear side. The discharge port 78d is disposed in a portion of the peripheral wall 78a that faces the lower end of the inclined surface 78 e. According to the present embodiment, the oil O flowing into the guide member 77 flows obliquely downward along the inclined surface 78e of the bottom wall 78b, and is discharged from the discharge port 78d opened in the peripheral wall 78 a. The discharge direction of the oil O can be set to a desired direction inside the guide member 77. This enables the oil O to be stably supplied to the stator 30 and the like.
The entire area of the ejection orifice 78d overlaps with the reservoir 10 when the ejection orifice 78d is viewed from above. For example, due to restrictions such as the layout of the interior of the motor housing 81, even if the opening 92d has a portion that does not overlap the reservoir 10 when viewed from above as in the present embodiment, the oil O can be efficiently supplied from the opening 92d to the reservoir 10 via the guide member 77.
As shown in fig. 2, the refrigerant receiving port 76 of the accumulator 10 receives the oil O from the discharge port 78 d. The guide cylinder 78 is in contact with the inner edge portion of the refrigerant receiving port 76, so that the guide cylinder 78 is prevented from rotating about the center axis C. Specifically, the locking projection 78f of the guide tube 78 contacts the inner edge portion of the refrigerant receiving port 76 in the direction around the center axis C of the guide tube 78, thereby suppressing the guide tube 78 from rotating around the center axis C. That is, the guide tube 78 and the refrigerant receiving port 76 are inhibited from rotating relative to each other about the center axis C of the guide tube 78 by a predetermined amount or more. According to the present embodiment, the oil O is stably supplied from the discharge port 78d to the refrigerant receiving port 76. The oil O can be stably supplied from the supply passage 92c to the reservoir 10 with a simple structure without adding another member for preventing the rotation of the guide cylinder 78. Further, since the inner edge portion of the refrigerant receiving port 76 is disposed close to the guide tube 78, the gap between the refrigerant receiving port 76 and the guide tube 78 is reduced, and leakage of the oil O from the gap to the outside of the accumulator 10 can be suppressed.
Fig. 5 shows a modification of the reservoir 10. In this modification, the wall portion 70 of the reservoir 10 has the bottom wall portion 71 and the side wall portion 72, but does not have the flange portion 73, the top wall portion 74, and the protruding portion 75. The bottom wall portion 71 and the side wall portion 72 are portions of a single member. The bottom wall portion 71 has a positioning portion 71a protruding upward from the bottom wall portion 71. The positioning portion 71a is located in the first flow path portion 11. The positioning portion 71a is provided in a pair. The pair of positioning portions 71a are arranged at intervals from each other in the axial direction, which is the direction in which the first flow path portion 11 extends. The positioning portion 71a is disposed at the front end portion of the bottom wall portion 71. Although not particularly shown, the positioning portion 71a contacts the locking projection 78f in the circumferential direction around the center axis C of the guide cylinder 78. Thereby, the guide cylinder 78 is prevented from rotating about the center axis C.
In the modification of fig. 5, the flow path 9 does not have the third flow path portion 13. In this modification, a part of the oil O discharged rearward from the discharge port 78d of the guide member 77 passes upward beyond the portion located on the side wall portion 72 of the first flow path portion 11 to reach the portion located on the rear side of the motor shaft J1 in the stator core 32. Therefore, the oil O can be supplied to the rear side portion of the stator core 32 without providing the third flow path portion 13.
As shown in fig. 1, the plug member 79 is attached to the top wall portion 81b of the motor housing portion 81. That is, the plug member 79 is mounted to the housing 6. The plug member 79 is, for example, a columnar plug member or the like. In the present embodiment, as shown in fig. 3, the opening 92d and the guide member 77 are disposed at one end, i.e., the lower end, of the through hole 81e, and the plug member 79 is disposed at the other end, i.e., the upper end, of the through hole 81 e. The plug member 79 closes the opening of the other end side of the through hole 81 e. In fig. 3, the plug member 79 is not shown. According to the present embodiment, when manufacturing the driving device 1 and the motor 2, the guide member 77 can be assembled to the opening 92d from the outside of the housing 6 through the through hole 81 e. After the guide member 77 is assembled, the opening on the other end side of the through hole 81e can be closed by attaching the plug member 79 to the through hole 81e from the outside of the housing 6. Therefore, the assembling work at the time of manufacturing is facilitated.
The plug member 79 is detachably fixed to the through hole 81 e. By detaching the plug member 79 from the through hole 81e, the guide member 77 can be operated from the outside of the housing 6 through the through hole 81 e. The guide member 77 can be detached from the outer peripheral surface of the housing 6 through the through hole 81 e. According to the present embodiment, the guide member 77 of the through hole 81e can be replaced by performing work from the outside of the housing 6. For example, the discharge direction of the oil O from the discharge port 78d can be changed, or the guide member 77 can be replaced with a new one. The oil O can be supplied to the stator 30 and the like efficiently and stably without performing complicated processing on the housing 6.
As shown in fig. 1, the inverter unit 8 is connected to the case 6. The inverter unit 8 is electrically connected to the motor 2. The inverter unit 8 controls the rotation of the motor 2.
< second embodiment >
Next, a driving device 100 and a motor 200 according to a second embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof may be omitted.
As shown in fig. 6, the structure of the motor 200 of the drive device 100 of the present embodiment is different from that of the above-described embodiment. The motor 200 does not have a reservoir 10. Therefore, the ejection port 78d of the guide member 77 is not opened in the reservoir 10. The guide member 77 overlaps the stator 30 when viewed from above. The ejection port 78d opens toward the outer surface of the stator 30. According to the present embodiment, the cooling efficiency of the stator 30 can be improved by directly discharging the cooled oil O to the outer surface of the stator 30.
At least a part of the supply passage upstream portion 92e is positioned on the partition wall 61 c. The supply path downstream portion 92f is disposed on the top wall portion 81b of the motor housing portion 81 and extends in the horizontal direction. In the present embodiment, the supply passage downstream portion 92f extends in the axial direction of the motor shaft J1.
Fig. 7 is a plan view schematically showing a part of the motor 200. As shown in fig. 7, the through holes 81e of the plurality of cases 6 are provided at the top wall portion 81b of the motor housing portion 81 with a space therebetween. In the present embodiment, the three through holes 81e are provided at equal intervals in the axial direction, which is the direction in which the supply path downstream portion 92f extends. Each through hole 81e is connected to the supply path downstream portion 92 f. A part of each through hole 81e constitutes a part of the supply path downstream portion 92 f. The opening 92d is disposed in each through hole 81 e. The plurality of openings 92d are provided at intervals from each other in the direction in which the supply passage downstream portion 92f extends, that is, in the direction in which a part of the supply passage 92c extends.
The guide member 77 is provided in plurality. The guide members 77 are disposed in the openings 92 d. In the present embodiment, the first guide member 77 of the plurality of guide members 77 is disposed above the coil end 33 a. The first guide member 77 overlaps the coil end portion 33a when viewed from above. The second guide member 77 of the plurality of guide members 77 is disposed above the coil end 33 b. The second guide member 77 overlaps the coil end portion 33b when viewed from above. The third guide member 77 of the plurality of guide members 77 is disposed above the stator core 32. The third guide member 77 overlaps the stator core 32 when viewed from above. According to the present embodiment, the oil O can be stably supplied to each part such as the stator 30 by the plurality of guide members 77.
Fig. 8 is a plan view schematically showing a part of a modification of the motor 200. In the modification shown in fig. 8, four through holes 81e are provided at unequal pitches in the axial direction, which is the direction in which the supply path downstream portion 92f extends. A plurality of third guide members 77 are provided at intervals in the axial direction. According to this modification, the oil O can be stably supplied to each part such as the stator 30 by the plurality of guide members 77.
At least one of the plurality of guide members 77 may be any one of the guide members 77A, 77B, 77C, 77D, 77E, and 77F of the following modifications shown in fig. 9 to 20. Specifically, for example, the guide members 77 located on the coil end portions 33a and 33b and the guide members 77 located on the stator core 32 may have different structures. A plurality of guide members 77 of different kinds can be used in appropriate combination.
Fig. 9 and 10 schematically show a guide member 77A as a first modification of the guide member 77. The bottom wall 78b of the guide member 77A has a plurality of inclined surfaces 78 e. The plurality of inclined surfaces 78e are inclined in different directions from each other. The first inclined surface 78e of the plurality of inclined surfaces 78e faces upward and one side in the horizontal direction. The second inclined surface 78e of the plurality of inclined surfaces 78e faces upward and toward the other side in the horizontal direction. A plurality of discharge ports 78d are provided. The discharge ports 78d are disposed in portions of the peripheral wall 78a that face the lower ends of the inclined surfaces 78 e. The plurality of discharge ports 78d are arranged at intervals in the circumferential direction around the center axis C of the guide cylinder 78. The plurality of discharge ports 78d are arranged at equal intervals in the circumferential direction around the central axis C, for example. That is, the plurality of discharge ports 78d are opened in different directions from each other in the guide cylinder 78. The receiving opening 78c penetrates the peripheral wall 78a, or is formed by an opening on the upper side of the cylindrical peripheral wall 78 a. According to the first modification, the oil O flowing into the guide tube 78 from the inlet port 78c flows in different directions along the inclined surfaces 78e, and is discharged from the discharge ports 78d in different directions. Therefore, the oil O can be efficiently supplied to the stator 30 and the like over a wide range.
Fig. 11 and 12 schematically show a guide member 77B as a second modification of the guide member 77. The bottom wall 78B of the guide member 77B has a curved inclined surface 78 e. Specifically, the inclined surface 78e is a conical surface protruding upward. According to the second modification, the oil O flowing from the inlet port 78C into the guide cylinder 78 flows to each position in the circumferential direction around the central axis C by the inclined surface 78e, and is discharged from the plurality of discharge ports 78d in different directions. Therefore, the oil O can be efficiently supplied to the stator 30 and the like over a wide range.
Fig. 13 and 14 schematically show a guide member 77C as a third modification of the guide member 77. The surface of the bottom wall 78b of the guide member 77C facing upward expands in the direction perpendicular to the center axis C. The bottom wall 78b does not have the inclined surface 78 e. The discharge port 78d penetrates the bottom wall 78b in the axial direction of the center axis C and extends in the vertical direction. That is, the discharge port 78d penetrates the bottom wall 78 b. According to the present embodiment, by discharging the oil O from the inside of the guide tube 78 through the discharge port 78d opened in the bottom wall 78b, it is possible to reach a position away from the guide member 77, for example, or to improve the accuracy of the discharge direction of the oil O. Further, for example, even when the central axis C of the guide cylinder 78 extends in a direction inclined with respect to the vertical direction or in the horizontal direction, the flow velocity of the oil O discharged from the discharge port 78d can be increased, and the oil O can be accurately supplied to a desired target member. Therefore, the oil can be stably supplied to the stator 30 and the like.
Fig. 15 and 16 schematically show a guide member 77D as a fourth modification of the guide member 77. The guide member 77D has a plurality of discharge ports 78D penetrating the bottom wall 78 b. The plurality of discharge ports 78d are disposed at intervals on the bottom wall 78 b. In the fourth modification, the same operational effects as described above can be obtained.
Fig. 17 and 18 schematically show a guide member 77E as a fifth modification of the guide member 77. The guide member 77E has a discharge port 78d penetrating the bottom wall 78 b. The inner diameter of the discharge port 78d increases from the inside of the guide cylinder 78 toward the outside along the center axis C of the guide cylinder 78. In the present embodiment, the inner diameter of the discharge port 78d increases downward from the upper surface of the bottom wall 78 b. According to the fifth modification, the same operational effects as described above can be obtained. The oil O in the guide tube 78 passes through the discharge port 78d, and is thus discharged in a diffused manner in a shower shape. Therefore, the efficiency of cooling the stator 30 and the like can be improved.
Fig. 19 and 20 schematically show a guide member 77F as a sixth modification of the guide member 77. The guide member 77F has a discharge port 78d penetrating the bottom wall 78 b. The discharge port 78d has: a tapered hole portion 78g whose inner diameter decreases from the inside of the guide cylinder 78 toward the outside along the center axis C of the guide cylinder 78; and a mist generating hole portion 78h connected to a portion of the tapered hole portion 78g having the smallest inner diameter. The tapered hole portion 78g has a conical hole shape, and the inner diameter thereof decreases from the upper surface of the bottom wall 78b toward the lower side. The mist generating hole 78h is formed in a circular hole shape and connected to a lower end of the tapered hole 78 g. According to the sixth modification, the oil O in the guide member 77 passes through the discharge port 78d, and is thus sprayed in a mist form. Therefore, the efficiency of cooling the stator 30 and the like can be improved.
The present invention is not limited to the above-described embodiments, and for example, as described below, structural modifications and the like can be made without departing from the scope of the present invention.
In the above-described embodiment, the refrigerant is oil O, but the present invention is not limited to this, and a refrigerant other than oil O may be used.
In the first embodiment described above, the predetermined direction in which the first flow path portion 11 of the reservoir 10 extends corresponds to the axial direction of the motor shaft J1, but the present invention is not limited to this. The predetermined direction may be a direction orthogonal to the axial direction or a direction inclined with respect to the axial direction when viewed from above.
In the first embodiment described above, the top wall portion 74 of the reservoir 10 overlaps with the portion of the bottom wall portion 71 located on the front side of the motor shaft J1 when viewed from above, but the present invention is not limited to this, and the top wall portion 74 may overlap with the portion of the bottom wall portion 71 located on the rear side of the motor shaft J1 when viewed from above. The top wall portion 74 may face the bottom wall portion 71 with a space from above over the entire area of the bottom wall portion 71.
Further, the configuration of the first embodiment in which the oil O is supplied from the guide member 77 of the opening 92d to the stator 30 and the like indirectly via the reservoir 10 and the configuration of the second embodiment in which the oil O is supplied directly to the stator 30 and the like without via the reservoir 10 may be combined as appropriate.
In addition, the respective configurations (constituent elements) described in the above-described embodiments, modifications, descriptions, and the like may be combined and additions, omissions, substitutions, and other modifications of the configurations may be made without departing from the spirit of the present invention. The present invention is not limited to the above-described embodiments, but is defined only by the claims.

Claims (12)

1. A motor is characterized by comprising:
a rotor that rotates about a motor shaft;
a stator facing the rotor with a gap in a radial direction;
a housing having a stator housing chamber housing the stator and a supply path through which a refrigerant for cooling the stator passes; and
a guide member that is disposed in an opening portion of the supply passage that opens into the stator housing chamber and that guides a flow of the refrigerant,
the guide member has a receiving opening for receiving the refrigerant from the opening portion and a discharge opening for discharging the refrigerant to the stator housing chamber.
2. The motor of claim 1,
comprises a plug member mounted on the housing,
the housing has a through hole penetrating a wall portion of the housing and provided with the opening portion,
one end of the through hole opens to the stator housing chamber, and the other end of the through hole opens to the outer peripheral surface of the housing,
the guide member is disposed at one end of the through hole,
the plug member is disposed at the other end of the through hole and closes the opening at the other end of the through hole.
3. The motor according to claim 1 or 2, comprising:
a cooler that cools the refrigerant and is connected to the supply path; and
a pump connected to the cooler and configured to feed the refrigerant to the cooler,
one end of the supply passage opens into the stator housing chamber through the opening, and the other end of the supply passage is connected to the pump via the cooler.
4. The motor according to any one of claims 1 to 3,
a storage in the form of a gutter that is positioned above the stator and stores the refrigerant,
the discharge port discharges the refrigerant to the reservoir,
the guide member supplies the refrigerant to the stator via the accumulator.
5. The motor according to any one of claims 1 to 3,
the discharge port opens toward an outer surface of the stator.
6. The motor according to any one of claims 1 to 5,
a plurality of the openings are provided at intervals in a direction in which a part of the supply path extends,
the above-mentioned guide member is provided in plurality,
each of the guide members is disposed in each of the openings.
7. The motor according to any one of claims 1 to 6,
the housing has a through hole penetrating a wall portion of the housing and provided with the opening portion,
one end of the through hole opens to the stator housing chamber, and the other end of the through hole opens to the outer peripheral surface of the housing,
the guide member is disposed at one end of the through hole,
the guide member can be detached from the outer peripheral surface of the housing through the through hole.
8. The motor according to any one of claims 1 to 7,
the guide member has a bottomed cylindrical guide tube having a central axis extending in the vertical direction,
the guide cylinder has a peripheral wall and a bottom wall,
the bottom wall has an inclined surface inclined with respect to the horizontal direction toward the upper side,
the discharge port is disposed in a portion of the peripheral wall that faces a lower end portion of the inclined surface, and penetrates the peripheral wall.
9. The motor according to any one of claims 1 to 8,
the guide member has a bottomed cylindrical guide tube,
the guide cylinder has a peripheral wall and a bottom wall,
the ejection port penetrates the bottom wall.
10. The motor of claim 9,
the inner diameter of the discharge port increases from the inside of the guide tube toward the outside along the central axis of the guide tube.
11. The motor of claim 9,
the discharge port includes:
a tapered hole portion whose inner diameter decreases from the inside of the guide cylinder toward the outside along the central axis of the guide cylinder; and
and a mist generating hole connected to the portion of the tapered hole having the smallest inner diameter.
12. A drive device mounted on a vehicle, comprising:
a motor as claimed in any one of claims 1 to 11; and
and a transmission device connected with the motor.
CN202110190377.8A 2020-02-18 2021-02-18 Motor and driving device Pending CN113346680A (en)

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JP2020025223A JP2021132431A (en) 2020-02-18 2020-02-18 Motor and drive device
JP2020-025223 2020-02-18

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CN113346680A true CN113346680A (en) 2021-09-03

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US5111090A (en) * 1989-11-07 1992-05-05 Aisin Aw Co., Ltd. Cooling device of a motor for vehicle
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JP2014107905A (en) * 2012-11-26 2014-06-09 Mitsubishi Motors Corp Rotary electric machine
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WO2018030324A1 (en) * 2016-08-09 2018-02-15 日本電産株式会社 Drive device
CN109563830A (en) * 2016-08-09 2019-04-02 日本电产株式会社 Driving device
WO2019208063A1 (en) * 2018-04-25 2019-10-31 日本電産株式会社 Motor unit
WO2020027436A1 (en) * 2018-07-31 2020-02-06 엘지전자 주식회사 Motor

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU773834A1 (en) * 1979-04-04 1980-10-23 Институт Электродинамики Ан Украинской Сср Electric machine stator
US5111090A (en) * 1989-11-07 1992-05-05 Aisin Aw Co., Ltd. Cooling device of a motor for vehicle
JP2004180376A (en) * 2002-11-25 2004-06-24 Nippon Soken Inc Rotating electric machine
JP2004180479A (en) * 2002-11-29 2004-06-24 Nissan Motor Co Ltd Cooling structure for motor
JP2011259644A (en) * 2010-06-11 2011-12-22 Toyota Motor Corp Cooling device
JP2012044760A (en) * 2010-08-18 2012-03-01 Toyota Motor Corp Cooling unit of rotary electric machine
US20120256501A1 (en) * 2011-04-11 2012-10-11 Honeywell International Inc. Oil cooled generator
JP2014107905A (en) * 2012-11-26 2014-06-09 Mitsubishi Motors Corp Rotary electric machine
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