WO2014125856A1 - Dispositif de refroidissement pour unité d'entraînement de moteur - Google Patents

Dispositif de refroidissement pour unité d'entraînement de moteur Download PDF

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Publication number
WO2014125856A1
WO2014125856A1 PCT/JP2014/050534 JP2014050534W WO2014125856A1 WO 2014125856 A1 WO2014125856 A1 WO 2014125856A1 JP 2014050534 W JP2014050534 W JP 2014050534W WO 2014125856 A1 WO2014125856 A1 WO 2014125856A1
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WO
WIPO (PCT)
Prior art keywords
oil
reservoir
drive unit
rotor
motor drive
Prior art date
Application number
PCT/JP2014/050534
Other languages
English (en)
Japanese (ja)
Inventor
平野　弘之
Original Assignee
日産自動車株式会社
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Filing date
Publication date
Application filed by 日産自動車株式会社 filed Critical 日産自動車株式会社
Priority to JP2015500161A priority Critical patent/JP5939351B2/ja
Publication of WO2014125856A1 publication Critical patent/WO2014125856A1/fr

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/043—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
    • B60K17/046—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel with planetary gearing having orbital motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/043—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0007—Disposition of motor in, or adjacent to, traction wheel the motor being electric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0038—Disposition of motor in, or adjacent to, traction wheel the motor moving together with the wheel axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0061—Disposition of motor in, or adjacent to, traction wheel the motor axle being parallel to the wheel axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2220/00—Electrical machine types; Structures or applications thereof
    • B60L2220/40—Electrical machine applications
    • B60L2220/44—Wheel Hub motors, i.e. integrated in the wheel hub
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2220/00—Electrical machine types; Structures or applications thereof
    • B60L2220/50—Structural details of electrical machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/42—Drive Train control parameters related to electric machines
    • B60L2240/425—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/03—Lubrication
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/05—Cooling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • 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

Definitions

  • the present invention relates to a cooling device for a motor drive unit useful as a drive unit for each wheel (in-wheel motor drive unit) used in, for example, an electric vehicle capable of traveling by driving wheels by individual electric motors.
  • Patent Document 1 As a cooling device for a motor drive unit, a device as described in Patent Document 1, for example, has been proposed.
  • This proposed technology is based on the premise that the electric motor has a dry structure, and oil is passed through a rotor shaft that can rotate together with a rotor that is driven to rotate by electromagnetic force generated between the stator and the rotor shaft. It lubricates the bearing at the tip.
  • the electric motor since the oil passes through the rotor shaft, the heat generated by the electric motor during operation is transferred to the oil through the rotor through heat exchange, and the oil takes this heat out of the electric motor.
  • the electric motor can be cooled.
  • the present invention it is necessary to increase the length of the oil passing through the rotor shaft (heat exchange passage length) for the purpose of improving the heat exchange efficiency, and it is necessary for the oil after heat exchange to pass through the long peripheral return circuit of the drive unit.
  • the cooling device for a motor drive unit comprises the following.
  • An electric motor is provided that supports a rotor shaft that can be rotated together with a rotor that is driven to rotate by electromagnetic force generated between the stator and a case at both ends in the axial direction of the rotor, and the rotor rotates from one end of the rotor shaft. Is output.
  • a cooling device for a motor drive unit includes: An oil supply reservoir and an oil discharge reservoir are mutually partitioned in the vicinity of one end of the rotor shaft, and an oil intermediate reservoir is defined in the vicinity of the other end,
  • the rotor shaft is provided with an oil supply path that passes between the oil supply reservoir and the oil intermediate reservoir, and an oil discharge path that passes between the oil intermediate reservoir and the oil discharge reservoir.
  • the former oil supply reservoir and the oil discharge reservoir of the oil supply reservoir and the oil discharge reservoir set in the vicinity of the same end of the rotor shaft are mutually connected to the rotor shaft.
  • the oil passes through the oil supply path provided, the oil intermediate reservoir set near the other end of the rotor shaft, and the oil discharge path provided on the rotor shaft.
  • the rotor (electric motor) can be cooled by heat exchange in the oil supply path and the oil discharge path.
  • heat can be exchanged with the rotor shaft while the oil passes through the oil supply passage of the rotor shaft and also through the oil discharge passage, and the oil rotor performing the heat exchange
  • the shaft passing length becomes longer, and the heat exchange efficiency can be improved.
  • the oil after the heat exchange does not need to be returned to the lower oil pan in the motor drive unit case by a long return circuit, for example.
  • the flow circuit length can be shortened.
  • the ratio of the oil rotor shaft passage length (heat exchange passage length) to the overall oil flow circuit length is increased, and the cooling efficiency of the rotor is increased in combination with the improvement of the heat exchange efficiency described above. Therefore, it is possible to solve the above-described conventional problems related to the rotor cooling efficiency.
  • FIG. 1 is a longitudinal side view showing an in-wheel motor drive unit including a cooling device according to a first embodiment of the present invention.
  • FIG. 2 is a transverse sectional view of a rotor shaft in FIG.
  • FIG. 5 is a longitudinal side view showing an in-wheel motor drive unit including a cooling device according to a second embodiment of the present invention.
  • FIG. 4 is a transverse sectional view showing a serration fitting portion of a rotor side shaft portion and a transmission gear side shaft portion forming a rotor shaft in FIG.
  • FIG. 5 is a longitudinal side view showing an in-wheel motor drive unit including a cooling device according to a third embodiment of the present invention.
  • FIG. 7 is a longitudinal side view showing an in-wheel motor drive unit including a cooling device according to a fourth embodiment of the present invention.
  • FIG. 10 is a longitudinal side view showing an in-wheel motor drive unit including a cooling device according to a fifth embodiment of the present invention.
  • FIG. 1 is a vertical side view showing a motor drive unit including a cooling device according to a first embodiment of the present invention.
  • this motor drive unit is configured as follows as an in-wheel motor drive unit for each wheel in an electric vehicle.
  • reference numeral 1 denotes a case body of an in-wheel motor drive unit.
  • the rear cover 2 has an opening on one side (the left side in FIG. 1) far from the wheel (not shown) of the case body 1, that is, on the side close to the vehicle body.
  • the other side of the case body 1 (the right side in FIG. 1) is closed with the front cover 3.
  • the unit body of the case body 1, the rear cover 2 and the front cover 3 forms a unit case of an in-wheel motor drive unit, and the electric motor 4 and the reduction transmission gear set 5 are housed in this unit case to drive the in-wheel motor. Configure the unit.
  • a partition wall 1a is provided to partition a chamber for storing the electric motor 4 and a chamber for storing the transmission gear set 5, and the electric motor 4 is provided between the partition wall 1a and the rear cover 2.
  • a chamber for storing the transmission gear set 5 is defined between the partition wall 1 a and the front cover 3.
  • the electric motor 4 includes an annular stator 4s fitted and fixed to the inner periphery of the case body 1, and a rotor 4r arranged concentrically with a radial gap on the inner periphery of the annular stator 4s. To do.
  • the rotor 4r has a rotor shaft 6 that penetrates through the center and is integrally coupled.
  • One end of the rotor shaft 6 is rotatably supported on the rear cover 2 by a bearing 7, and the other end is supported by a partition wall 1a of the case body 1 by a bearing 8.
  • the rotor 4r is supported concentrically in the stator 4s by being rotatably supported on the rotor 4r.
  • the transmission gear set 5 corresponds to the rotational transmission system in the present invention, and in this embodiment, this is a motor rotation output gear 21 that is serrated and fixed to the end of the rotor shaft 6 protruding from the partition wall 1a, and this And a counter gear 22 meshing with each other.
  • the motor rotation output gear 21 is supported on the partition wall 1a by the bearing 8 on the side close to the rotor 4r. As a result, the bearing 8 supports the corresponding end of the rotor shaft 6 with respect to the partition wall 1a as described above. Try to do it.
  • the motor rotation output gear 21 is supported on the front cover 3 by the bearing 23 on the opposite side far from the rotor 4r, thereby defining an oil supply reservoir 24 between the end surface of the rotor shaft 6 close to the front cover 3 and the front cover 3.
  • the front cover 3 is formed with an opening 3a for allowing the inflow of oil by opening an upper portion of the oil supply reservoir 24.
  • annular oil guide 25 is provided to guide the oil in the oil supply reservoir 24 so that the oil easily enters the corresponding opening end of the rotor shaft hollow hole 6a (oil supply path).
  • the inner race is sandwiched between the outer race of the bearing 23 and the front cover 3, and the inner peripheral cylindrical portion is fitted to the corresponding opening end of the rotor shaft hollow hole 6a.
  • an orifice for directing a part of the oil in the oil supply reservoir 24 to the bearing 23 is preferably provided on the outer periphery of the oil guide 25.
  • An annular oil seal 26 is provided at an axial position between the bearing 8 of the motor rotation output gear 21 (rotor shaft 6) and the rotor 4r, and the outer periphery of the oil seal 26 is fitted to the partition wall 1a.
  • an oil discharge reservoir 27 is defined between the bearing 8 and the oil seal 26.
  • the rotor shaft 6 is formed with an oil discharge path 6b that passes between the oil discharge pool 27 and the oil intermediate pool 11.
  • a plurality of oil discharge passages 6b are set as a set, and these oil discharge passages 6b are peripheral holes arranged at equal intervals in the circumferential direction around the rotor shaft hollow hole 6a (oil supply passage). Good.
  • the counter gear 22 is formed integrally with the counter shaft 28, and an output shaft 29 is provided so as to face the counter shaft 28 coaxially.
  • the output shaft 29 is disposed so as to be coaxially butted against the end surface of the countershaft 29 far from the partition wall 1a, and the butted ends of the output shaft 29 and the countershaft 29 are fitted to each other and a bearing 31 is fitted to the mutual fitting portion.
  • the output shaft 29 and the countershaft 29 are allowed to rotate relative to each other.
  • the end of the countershaft 29 far from the output shaft 29 is rotatably supported with respect to the partition wall 1a by the bearing 32, and an oil lower reservoir 33 is defined between the end of the countershaft 29 and the partition wall 1a.
  • the partition wall 1a is provided with a communication passage 1b for passing between the oil lower reservoir 33 and the oil discharge reservoir 27.
  • An annular oil guide 34 is provided to guide the oil in the lower oil reservoir 33 so that the oil easily enters the corresponding open end of the hollow hole 28a of the countershaft 28.
  • the oil guide 34 has an outer peripheral portion that is connected to the outer race of the bearing 32. It is sandwiched between the partition wall 1a and the inner peripheral cylinder portion is fitted to the corresponding opening end of the countershaft hollow hole 28a.
  • an orifice for directing a part of the oil in the lower oil reservoir 33 to the bearing 32 is preferably provided on the outer periphery of the oil guide 34.
  • a wheel hub 35 is serrated and fitted to the output shaft 29, and the wheel hub 35 is rotatably supported on the front cover 3 by a bearing 36.
  • the bearing 36 also serves to support the end of the counter shaft 28 far from the partition wall 1a via the wheel hub 35, the output shaft 29 and the bearing 31.
  • An annular oil seal 37 is provided between the opening of the front cover 3 through which the output shaft 29 penetrates and the output shaft 29, and the outer periphery of the oil seal 37 is fitted into the opening of the front cover 3, and the inner periphery Is slidable on the outer periphery of the output shaft 29.
  • an oil pan 38 capable of storing oil is set in the lower portion of the storage chamber for the transmission gear set 5 defined between the partition wall 1a and the front cover 3.
  • the oil level in the oil pan 38 is set to such a height that the lower part of the counter gear 22 is immersed.
  • a plurality of wheel bolts 39 extending in the axial direction from the flange portion thereof are fixed to the wheel hub 35 at regular intervals in the circumferential direction, and a wheel (not shown) is attached to the wheel hub 35 with the wheel bolts 39. To wear.
  • a planetary gear type reduction gear set 41 is provided for drivingly coupling the counter shaft 28 and the output shaft 29 that can rotate relative to each other.
  • This planetary gear type reduction gear set 41 is fixed to the front cover 3 by arranging a sun gear 41s integrally formed with the counter shaft 28 at an axial position between the counter gear 22 and the bearing 31 so as to surround the sun gear 41s concentrically.
  • a simple planetary gear set including the ring gear 41r, a plurality of planetary pinions 41p meshing with the sun gear 41s and the ring gear 41r, and a carrier 41c that rotatably supports the planetary pinions 41p.
  • the planetary gear type reduction gear set 41 functions as an input element in which the sun gear 41s receives rotation from the countershaft 28, the ring gear 41r functions as a reaction force element that receives a reaction force when the sun gear 41s rotates, and the carrier 41c It functions as an output element that outputs the rotation of the sun gear 41s under deceleration. Accordingly, the carrier 41c is integrally coupled to the corresponding end of the output shaft 29, whereby the rotation of the countershaft 28 is decelerated by the planetary gear type reduction gear set 41 toward the output shaft 29 and used for driving the wheels. To make.
  • the reduction transmission gear set 5 and the planetary gear type reduction gear set 41 rotate the electric motor 4 to the rotor shaft 6, the gear ratio between the motor rotation output gear 21 and the counter gear 22, and the sun gear 41s.
  • the speed is reduced by two steps with the gear ratio determined by the number of teeth and the number of teeth of the ring gear 41r and transmitted to the output shaft 29.
  • the rotation to the output shaft 29 is transmitted to a wheel (not shown) via a wheel hub 35 and a wheel bolt 39 coupled to the output shaft 29, and the vehicle can be driven by the rotational driving of the wheel.
  • the rotor shaft hollow hole 6a (oil supply path) passes through the rotor shaft hollow hole 6a (oil supply path) as shown by arrow C, and then the oil intermediate pool 11 passes through the oil discharge path 6b as shown by arrow D. Reaching oil discharge reservoir 27. While the oil passes through the rotor shaft hollow 6a (oil supply path) and the oil discharge path 6b, the heat can be removed from the rotor 4r by heat exchange to cool the rotor 4r (electric motor 4).
  • the oil in the lower oil reservoir 33 is returned to the oil pan 38 after being provided for lubrication of the bearing 32 through the outer peripheral orifice of the oil guide 34 as indicated by an arrow F, and the remainder as indicated by arrows G and H.
  • the oil After being used for lubrication of the bearing 31 and the planetary gear type reduction gear set 41 through the countershaft hollow hole 28a, the oil returns to the oil pan 38.
  • the oil that has returned to the oil pan 38 is cooled by cooling fins (not shown) installed in the oil pan 38, and is again scraped up from the oil pan 38 by the reduction transmission gear set 5, and the above-mentioned bearing lubrication and The electric motor 4 is used for cooling.
  • the oil supply reservoir 24 and the oil discharge reservoir 27 are mutually connected to the motor rotation output gear 21 near the same end of the rotor shaft 6 (the right end in FIG. 1).
  • An oil intermediate reservoir 11 is set near the other end of the rotor shaft 6 (left end in FIG. 1), an oil supply path 6a from the oil supply reservoir 24 to the oil intermediate reservoir 11, and an oil intermediate reservoir 11 Since the rotor shaft 6 is provided with the oil discharge path 6b extending from the oil discharge reservoir 27 to the oil discharge reservoir 27, the following effects can be obtained as is apparent from the cooling action of the electric motor described above.
  • the electric motor 4 can be cooled by exchanging heat with the rotor shaft 6 not only while the oil passes through the oil supply passage 6a of the rotor shaft 6 but also through the oil discharge passage 6b.
  • the length of the oil passing through the rotor shaft becomes longer and the heat exchange efficiency can be improved.
  • the overall oil flow circuit length can be shortened as described above, the pressure loss of the circuit can be reduced and the oil flow energy can be saved. Improvement can be realized.
  • the oil passage does not leak due to an external force or the like. There is no fear of leaking.
  • the motor drive unit is not increased in size.
  • the oil flow direction in the rotor shaft 6 is specified, the oil flow speed in the rotor shaft 6 is fast, and also in this respect, the efficiency of the heat exchange (heat removal) described above is increased. Can do.
  • the oil flow path is relatively short and thick, a reduction in pipe resistance can be realized, and a sufficient oil flow rate can be ensured even if the motor speed is low.
  • This effect becomes even more remarkable by providing a plurality of oil discharge passages 6b in the rotor shaft 6.
  • the plurality of oil discharge passages 6b increase the contact area between the oil and the rotor shaft 6, and can further improve the heat exchange (heat removal) efficiency.
  • the oil supply reservoir 24 and the corresponding end surface of the rotor shaft 6 are oil supply reservoirs as shown in the figure. 24, the rotor shaft 6 is hollow, so that the rotor shaft hollow hole 6a can be used as an oil supply path, and the process of forming the oil supply path in the rotor shaft 6 is not necessary. This is also advantageous in terms of cost.
  • the oil discharge reservoir 27 is defined around the outer peripheral surface of the corresponding end of the rotor shaft 6, and the oil discharge passage 6b is arranged around the rotor shaft hollow hole 6a to form the peripheral hole formed in the rotor shaft 6.
  • the oil supply reservoir 24 and the oil discharge reservoir 27 are arranged on both sides in the axial direction of the motor rotation output gear 21, respectively, so that when the oil supply reservoir 24 and the oil discharge reservoir 27 are partitioned from each other, as shown in FIG.
  • the motor rotation output gear 21 can be used, and the mutual partition between the oil supply reservoir 24 and the oil discharge reservoir 27 can be easily and reliably performed.
  • the oil supply to the oil supply reservoir 24 can be performed at low cost only by the viscosity loss of the oil.
  • the rotor shaft hollow hole 6a is used as an oil supply path, and the open end of the rotor shaft hollow hole 6a far from the oil supply reservoir 24 and the oil discharge reservoir 27 is closed by the resolver shaft 9, so that the oil intermediate reservoir 11 is blocked. Therefore, the oil intermediate reservoir 11 can be easily and inexpensively set. At this time, the existing resolver shaft 9 is used, which is further advantageous in terms of cost.
  • FIG. 3 is a vertical side view showing a motor drive unit including a cooling device according to a second embodiment of the present invention. Also in this embodiment, since the motor drive unit is basically configured as an in-wheel motor drive unit similar to that described above with reference to FIG. 1, the same parts in FIG. 3 as those in FIG. I stopped showing and avoided duplicate explanations.
  • the rotor shaft 6 is composed of a rotor side shaft portion 51 (outer shaft) and a transmission gear side shaft portion 52 (inner shaft). It is assumed that the rotor-side shaft portion 51 penetrates and is fixed to the center of the rotor 4r and is integrally formed with a resolver shaft end 51a similar to the resolver shaft 9 in FIG. Further, the rotor-side shaft portion 51 has a center blind hole that opens at an end surface far from the resolver shaft end 51a, and the transmission gear-side shaft portion 52 is inserted into the center blind hole so that the center blind of the rotor-side shaft portion 51 is inserted. An oil intermediate reservoir 11 is defined between the hole bottom wall and the insertion end of the transmission gear side shaft portion 52.
  • the serration fitting portion 53 for rotationally engaging the rotor side shaft portion 51 and the transmission gear side shaft portion 52 is provided. It is set between the rotor side shaft portion 51 and the transmission gear side shaft portion 52.
  • the serration fitting portion 53 has a normal cross-section as shown in FIG. 4, but the serration fitting portion 53 has a portion of the serration teeth on the outer periphery of the transmission gear side shaft portion 52 removed.
  • the transmission gear side shaft portion 52 is constituted by a hollow shaft, and the hollow hole 52a is used as the oil supply path 55.
  • the motor rotation output gear 21 of the transmission gear set 5 is serrated to the protruding end of the transmission gear side shaft portion 52 protruding from the center blind hole of the rotor side shaft portion 51.
  • the motor rotation output gear 21 is supported on the partition 1a by the bearing 8 on the side close to the rotor 4r.
  • the bearing 8 is also used for supporting the protruding end of the transmission gear side shaft portion 52 with respect to the partition 1a. It will be.
  • the motor rotation output gear 21 is supported on the front cover 3 on the opposite side far from the rotor 4r by the bearing 23, whereby an oil supply pool is provided between the end surface of the transmission gear side shaft portion 52 close to the front cover 3 and the front cover 3.
  • the front cover 3 is formed with an opening 3a for allowing the inflow of oil by opening an upper portion of the oil supply reservoir 24.
  • annular oil guide 25 is provided for guiding the oil in the oil supply reservoir 24 so that the oil easily enters the corresponding opening end of the hollow hole 52a (oil supply path) of the transmission gear side shaft portion 52.
  • the outer peripheral portion is sandwiched between the outer race of the bearing 23 and the front cover 3, and the inner peripheral cylindrical portion is fitted to the corresponding opening end of the hollow hole 52a in the transmission gear side shaft portion 52.
  • an orifice for directing a part of the oil in the oil supply reservoir 24 to the bearing 23 is preferably provided on the outer periphery of the oil guide 25.
  • An annular oil seal 26 is provided at a position in the axial direction between the bearing 8 of the motor rotation output gear 21 (transmission gear side shaft portion 52) and the rotor 4r, and the outer periphery of the oil seal 26 is fitted to the partition wall 1a. And an oil discharge pool 27 is defined between the bearing 8 and the oil seal 26 by fitting the inner periphery to the outer periphery of the transmission gear side shaft portion 52 so as to be slidable.
  • the oil intermediate reservoir 11 reaches the oil intermediate reservoir 11 through the hollow hole 52a (oil supply path 55) of the transmission gear side shaft portion 52 as indicated by the arrow C, and then from the oil intermediate reservoir 11 as indicated by the arrow D.
  • An oil discharge reservoir 27 is reached via the oil discharge path 54. While the oil passes through the hollow hole 52a (oil supply path 55) and the oil discharge path 54 of the transmission gear side shaft portion 52, heat can be removed from the rotor 4r by heat exchange to cool the rotor 4r (electric motor 4). it can.
  • the oil in the lower oil reservoir 33 is returned to the oil pan 38 after being provided for lubrication of the bearing 32 through the outer peripheral orifice of the oil guide 34 as indicated by an arrow F, and the remainder as indicated by arrows G and H.
  • the oil pan 38 After being provided for lubrication of the bearing 31 through the countershaft hollow hole 28a, the oil pan 38 returns.
  • the oil that has returned to the oil pan 38 is cooled by cooling fins (not shown) installed in the oil pan 38, and is again scraped up from the oil pan 38 by the reduction transmission gear set 5, and the above-mentioned bearing lubrication and The electric motor 4 is used for cooling.
  • the rotor shaft 6 is placed on the shaft end surface of the rotor side shaft portion (outer shaft) 51 that rotates together with the rotor 4r and the rotor side shaft portion (outer shaft) 51 close to the oil supply reservoir 24 and the oil discharge reservoir 27. It is composed of a transmission gear side shaft portion (inner shaft) 52 inserted into the opening axial direction blind hole under rotational engagement by serration fitting 53, and the rotor side shaft portion (outer shaft) 51 is blinded in the axial direction.
  • An oil intermediate reservoir 11 is defined between the hole and the insertion tip of the transmission gear side shaft portion (inner shaft) 52, and the transmission gear side shaft portion (inner shaft) 52 is constituted by a hollow shaft.
  • the rotor-side shaft portion (outer shaft) 51 can be reduced in weight by a large-diameter axial blind hole provided in the rotor-side shaft portion (outer shaft) 51, thereby reducing the rotational inertia of the motor drive system by that amount.
  • the transient response of driving can be improved.
  • the oil discharge passage 54 can be increased in diameter as described above, the degree of freedom in setting the passage opening area is increased, and the oil in the rotor shaft 6 can be set by appropriately setting the passage opening area. It is possible to freely set the flow rate (time for the oil to pass through the rotor shaft 6), and the efficiency of heat removal from the rotor 4r can be improved.
  • FIG. 5 is a longitudinal side view showing a motor drive unit including a cooling device according to a third embodiment of the present invention. Also in this embodiment, since the motor drive unit is basically configured as an in-wheel motor drive unit similar to that described above with reference to FIGS. 1 and 3, the same parts in FIG. In order to avoid duplicate explanations
  • the rotor shaft 6 is divided into a rotor side shaft portion 51 (outer shaft) and a transmission gear side shaft portion 52 (inner shaft) similar to FIG. Constitute.
  • the serration fitting portion 53 for rotational engagement set between the rotor side shaft portion 51 and the transmission gear side shaft portion 52 is positioned in the middle in the axial direction of the rotor 4r.
  • the serration fitting portion 53 for rotational engagement between the rotor side shaft portion 51 and the transmission gear side shaft portion 52 is positioned in the middle in the axial direction of the rotor 4r.
  • the heat generated by the electric motor 4 reaching the rotor 4r efficiently reaches the rotor side shaft 51 and the transmission gear side shaft 52, and the volume of the high temperature portion of the rotor side shaft 51 and the transmission gear side shaft 52 is reduced. This increases the cooling efficiency of the rotor 4r (electric motor 4) by heat exchange with oil.
  • FIG. 6 is a vertical side view showing a motor drive unit including a cooling device according to a fourth embodiment of the present invention. Also in this embodiment, since the motor drive unit is basically configured as an in-wheel motor drive unit similar to that described above with reference to FIGS. 1, 3, and 5, in FIG. 6, the same as in FIGS. The parts are indicated by the same reference numerals, and redundant explanation is avoided.
  • the rotor shaft 6 is replaced with a rotor side shaft portion 51 (outer shaft) and a transmission gear side shaft portion 52 ( As in FIG. 5, the serration fitting portion 53 for rotational engagement between the rotor side shaft portion 51 and the transmission gear side shaft portion 52 is positioned in the middle in the axial direction of the rotor 4r.
  • the motor rotation output gear 21 to be provided at the projecting end portion of the transmission gear side shaft portion 52 protruding from the rotor side shaft portion 51 is integrally formed with the transmission gear side shaft portion 52.
  • FIG. 7 is a longitudinal side view showing a motor drive unit including a cooling device according to a fifth embodiment of the present invention. Also in this embodiment, the motor drive unit is basically configured as an in-wheel motor drive unit similar to that described above with reference to FIGS. 1, 3, 5, and 6, and therefore, in FIG. The same parts as in the above are indicated by the same reference numerals, and redundant explanation is avoided.
  • the rotor shaft 6 is arranged on the rotor side shaft 51 (outer shaft) and the transmission gear side as in FIGS. It is composed of a shaft portion 52 (inner shaft), and the serration fitting portion 53 for rotational engagement between the rotor side shaft portion 51 and the transmission gear side shaft portion 52 is located in the middle in the axial direction of the rotor 4r as in FIGS.
  • the in-wheel motor drive unit is basically the same as that in FIG.
  • the oil auxiliary supply path 61 is used as a safety measure when the amount of oil scraped by the reduction gear set 5 is insufficient due to low motor rotation, large motor torque, or low oil temperature (high viscosity). Is provided.
  • the oil auxiliary supply path 61 is arranged with one end opened in the oil pan 38 and the other end opened in the oil supply reservoir 24.
  • the oil pump 62 is inserted into the oil auxiliary supply path 61, and is preferably disposed at the end of the oil auxiliary supply path 61 close to the oil pan 38 as shown in the drawing.
  • the oil pump 62 detects the detected value of the oil temperature sensor 63 that detects the temperature of the oil stored in the oil pan 38, the detected value of the rotation of the rotary resolver 12 that detects the number of rotations of the electric motor 4, and the output torque of the electric motor 4.
  • the amount of oil scraped by the reduction gear set 5 is insufficient, during low motor rotation, when large motor torque is output, and at low oil temperature (high viscosity) It is sometimes driven and the oil in the oil pan 38 is supplied into the oil supply reservoir 24 also by the oil auxiliary supply path 61 for safety measures.
  • the cooling of the electric motor 4 and the lubrication of the rotating part cannot be performed as required if only the amount of oil scraped by the reduction gear set 5 is used.
  • the oil in the oil pan 38 can be directed from the auxiliary oil supply path 61 into the oil supply reservoir 24 by driving the oil pump 62.
  • the in-wheel motor drive unit can be continuously operated without falling into poor lubrication or insufficient motor cooling even under conditions where the amount of oil scraped by the reduction gear set 5 is insufficient.
  • driving the oil pump 62 constantly increases power consumption and shortens the vehicle travel distance
  • the oil pump 62 is driven only under conditions where the amount of oil scraped by the reduction gear set 5 is insufficient. Therefore, it is possible to avoid sacrificing the vehicle travel distance and increase the efficiency of the entire vehicle.
  • the oil supply reservoir 24 and the oil discharge reservoir 27 disposed on the same one end side of the rotor shaft 6 are mutually partitioned, the oil supply reservoir 24 and the oil discharge are disposed on both sides in the axial direction of the motor rotation output gear 21.
  • the reservoir 27 is disposed, and the oil supply reservoir 24 and the oil discharge reservoir 27 are separated from each other by using the motor rotation output gear 21, but this partition is not dependent on the use of the motor rotation output gear 21. Needless to say, it may be performed by adding another part.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Abstract

L'invention porte sur une unité d'entraînement de moteur, laquelle unité est configurée de telle sorte qu'un arbre de rotor (6) tournant avec un rotor (4r) disposé dans un stator (4s) de façon coaxiale à celui-ci est porté par un palier des deux côtés d'un carter, et que la rotation du rotor est extraite par un engrenage (21) disposé à une extrémité de l'arbre de rotor (6). Un passage d'huile de refroidissement pour l'unité d'entraînement à moteur est constitué par un réservoir d'alimentation en huile (24) et un réservoir de décharge d'huile (27) séparés l'un de l'autre des deux côtés dans la direction axiale de l'engrenage (21) au voisinage de la première extrémité de l'arbre de rotor (6) ; un réservoir d'huile intermédiaire (11) disposé au voisinage de l'autre extrémité de l'arbre de rotor (6) ; un passage d'alimentation en huile (6a) disposé dans le centre de l'arbre de rotor (6) de façon à relier le réservoir d'alimentation en huile (24) et le réservoir intermédiaire d'huile (11) ; et un passage de décharge d'huile (6b) disposé sur l'arbre de rotor (6) autour du passage d'alimentation en huile (6a) de façon à relier le réservoir intermédiaire d'huile (11) et le réservoir de décharge d'huile (27).
PCT/JP2014/050534 2013-02-15 2014-01-15 Dispositif de refroidissement pour unité d'entraînement de moteur WO2014125856A1 (fr)

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DE102015214309A1 (de) * 2015-07-29 2017-02-02 Bayerische Motoren Werke Aktiengesellschaft Hohlwellenkühlung für einen Antrieb eines Elektrofahrzeugs
WO2017064390A1 (fr) * 2015-10-15 2017-04-20 Renault S.A.S Dispositif de gestion thermique d'un groupe motopropulseur électrique
CN107791823A (zh) * 2016-08-29 2018-03-13 丰田自动车株式会社 轮毂电动机单元
JP2018103977A (ja) * 2016-12-26 2018-07-05 Ntn株式会社 インホイールモータ駆動装置
CN108263187A (zh) * 2016-12-30 2018-07-10 比亚迪股份有限公司 动力传动***及具有其的车辆
CN108473044A (zh) * 2016-10-14 2018-08-31 Ntn株式会社 轮内电动机驱动装置
JP2018154286A (ja) * 2017-03-21 2018-10-04 トヨタ自動車株式会社 インホイールモータユニット
CN110999040A (zh) * 2017-07-28 2020-04-10 日本电产株式会社 马达
KR20200080660A (ko) * 2018-12-27 2020-07-07 현대트랜시스 주식회사 인휠모터 파워트레인의 윤활시스템
EP3677754A1 (fr) * 2019-01-04 2020-07-08 Ge Aviation Systems Llc, Inc. Générateur et raccord rotatif dotés d'une interface sans contact
EP3751707A4 (fr) * 2018-02-12 2021-04-07 BYD Company Limited Ensemble électrique et véhicule le comprenant
EP3751708A4 (fr) * 2018-02-12 2021-04-07 BYD Company Limited Ensemble de puissance et véhicule équipé de ce dernier
EP3751709A4 (fr) * 2018-02-12 2021-04-14 BYD Company Limited Ensemble de puissance et véhicule le comprenant
WO2021182011A1 (fr) * 2020-03-09 2021-09-16 Ntn株式会社 Dispositif d'entraînement de moteur-roue
DE102020107535A1 (de) 2020-03-19 2021-09-23 Bayerische Motoren Werke Aktiengesellschaft Hohlwelleneinrichtung mit passiver Flüssigkeitsversorgung und Antriebsvorrichtung mit Hohlwelleneinrichtung
DE102021104473A1 (de) 2021-02-25 2022-08-25 Bayerische Motoren Werke Aktiengesellschaft Hohlwelleneinrichtung mit passiver Flüssigkeitsversorgung und Antriebsvorrichtung mit Hohlwelleneinrichtung
EP4067142A1 (fr) * 2021-03-31 2022-10-05 Nabtesco Corporation Unité d'entraînement de chenille et machine de construction

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EP3750729B1 (fr) * 2018-02-12 2023-06-07 BYD Company Limited Ensemble de puissance et véhicule en étant pourvu
CN113905917A (zh) * 2020-05-27 2022-01-07 华为技术有限公司 一种动力总成及电动车
DE102022109011A1 (de) 2022-04-13 2023-10-19 Schaeffler Technologies AG & Co. KG Lagervorrichtung mit einem Fluidleitelement und Getriebevorrichtung

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Publication number Priority date Publication date Assignee Title
DE102015214309A1 (de) * 2015-07-29 2017-02-02 Bayerische Motoren Werke Aktiengesellschaft Hohlwellenkühlung für einen Antrieb eines Elektrofahrzeugs
CN108292881B (zh) * 2015-10-15 2020-03-27 雷诺股份公司 用于电动力传动系的热管理的装置
WO2017064390A1 (fr) * 2015-10-15 2017-04-20 Renault S.A.S Dispositif de gestion thermique d'un groupe motopropulseur électrique
FR3042658A1 (fr) * 2015-10-15 2017-04-21 Renault Sas Dispositif de gestion thermique d'un groupe motopropulseur electrique.
CN108292881A (zh) * 2015-10-15 2018-07-17 雷诺股份公司 用于电动力传动系的热管理的装置
JP2018537933A (ja) * 2015-10-15 2018-12-20 日産自動車株式会社 電動パワートレインの熱管理装置
RU2713405C2 (ru) * 2015-10-15 2020-02-05 Рено С.А.С Устройство термического управления электрической силовой установки
CN107791823A (zh) * 2016-08-29 2018-03-13 丰田自动车株式会社 轮毂电动机单元
US10938272B2 (en) 2016-10-14 2021-03-02 Ntn Corporation In-wheel motor drive device
CN108473044A (zh) * 2016-10-14 2018-08-31 Ntn株式会社 轮内电动机驱动装置
EP3527413A4 (fr) * 2016-10-14 2020-04-08 NTN Corporation Dispositif d'entraînement de moteur-roue
JP2018103977A (ja) * 2016-12-26 2018-07-05 Ntn株式会社 インホイールモータ駆動装置
JP7029287B2 (ja) 2016-12-26 2022-03-03 Ntn株式会社 インホイールモータ駆動装置
CN108263187B (zh) * 2016-12-30 2021-01-01 比亚迪股份有限公司 动力传动***及具有其的车辆
CN108263187A (zh) * 2016-12-30 2018-07-10 比亚迪股份有限公司 动力传动***及具有其的车辆
JP2018154286A (ja) * 2017-03-21 2018-10-04 トヨタ自動車株式会社 インホイールモータユニット
DE102017125939B4 (de) 2017-03-21 2024-04-11 Toyota Jidosha Kabushiki Kaisha Radnabenmotoreinheit
CN110999040A (zh) * 2017-07-28 2020-04-10 日本电产株式会社 马达
EP3751707A4 (fr) * 2018-02-12 2021-04-07 BYD Company Limited Ensemble électrique et véhicule le comprenant
US11735974B2 (en) 2018-02-12 2023-08-22 Byd Company Limited Electric assembly and vehicle having the same
EP3751709A4 (fr) * 2018-02-12 2021-04-14 BYD Company Limited Ensemble de puissance et véhicule le comprenant
US12021434B2 (en) 2018-02-12 2024-06-25 Byd Company Limited Electric assembly and vehicle having the same
US11843304B2 (en) 2018-02-12 2023-12-12 Byd Company Limited Electric assembly and vehicle having the same
EP3751708A4 (fr) * 2018-02-12 2021-04-07 BYD Company Limited Ensemble de puissance et véhicule équipé de ce dernier
EP4220909A1 (fr) * 2018-02-12 2023-08-02 BYD Company Limited Ensemble électrique et véhicule le comprenant
EP4220910A1 (fr) * 2018-02-12 2023-08-02 BYD Company Limited Ensemble électrique et véhicule le comprenant
US11611258B2 (en) 2018-02-12 2023-03-21 Byd Company Limited Electric assembly and vehicle having the same
US11509191B2 (en) 2018-02-12 2022-11-22 Byd Company Limited Electric assembly and vehicle having the same
KR102588326B1 (ko) 2018-12-27 2023-10-11 현대트랜시스 주식회사 인휠모터 파워트레인의 윤활시스템
KR20200080660A (ko) * 2018-12-27 2020-07-07 현대트랜시스 주식회사 인휠모터 파워트레인의 윤활시스템
EP3677754A1 (fr) * 2019-01-04 2020-07-08 Ge Aviation Systems Llc, Inc. Générateur et raccord rotatif dotés d'une interface sans contact
US11002191B2 (en) 2019-01-04 2021-05-11 Ge Aviation Systems Llc Electric machine with non-contact interface
WO2021182011A1 (fr) * 2020-03-09 2021-09-16 Ntn株式会社 Dispositif d'entraînement de moteur-roue
DE102020107535A1 (de) 2020-03-19 2021-09-23 Bayerische Motoren Werke Aktiengesellschaft Hohlwelleneinrichtung mit passiver Flüssigkeitsversorgung und Antriebsvorrichtung mit Hohlwelleneinrichtung
DE102021104473A1 (de) 2021-02-25 2022-08-25 Bayerische Motoren Werke Aktiengesellschaft Hohlwelleneinrichtung mit passiver Flüssigkeitsversorgung und Antriebsvorrichtung mit Hohlwelleneinrichtung
EP4067142A1 (fr) * 2021-03-31 2022-10-05 Nabtesco Corporation Unité d'entraînement de chenille et machine de construction

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