WO2023243277A1 - ユニット - Google Patents

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Publication number
WO2023243277A1
WO2023243277A1 PCT/JP2023/017854 JP2023017854W WO2023243277A1 WO 2023243277 A1 WO2023243277 A1 WO 2023243277A1 JP 2023017854 W JP2023017854 W JP 2023017854W WO 2023243277 A1 WO2023243277 A1 WO 2023243277A1
Authority
WO
WIPO (PCT)
Prior art keywords
gear
axis
unit
differential
shaft
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.)
Ceased
Application number
PCT/JP2023/017854
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
篤志 前田
明 諏訪林
稔 菖一
弘樹 上原
晃 神山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JATCO Ltd
Original Assignee
JATCO Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by JATCO Ltd filed Critical JATCO Ltd
Priority to CN202380046323.1A priority Critical patent/CN119343548A/zh
Priority to JP2024528385A priority patent/JP7676667B2/ja
Priority to US18/873,587 priority patent/US20250361933A1/en
Priority to EP23821877.0A priority patent/EP4538559A4/en
Publication of WO2023243277A1 publication Critical patent/WO2023243277A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/048—Type of gearings to be lubricated, cooled or heated
    • F16H57/0493—Gearings with spur or bevel gears 
    • F16H57/0494—Gearings with spur or bevel gears  with variable gear ratio or for reversing rotary 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
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/20—Toothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/031—Gearboxes; Mounting gearing therein characterised by covers or lids for gearboxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/042—Guidance of lubricant
    • F16H57/0421—Guidance of lubricant on or within the casing, e.g. shields or baffles for collecting lubricant, tubes, pipes, grooves, channels or the like
    • F16H57/0424—Lubricant guiding means in the wall of or integrated with the casing, e.g. grooves, channels, holes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/045—Lubricant storage reservoirs, e.g. reservoirs in addition to a gear sump for collecting lubricant in the upper part of a gear case
    • F16H57/0453—Section walls to divide a gear sump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0457—Splash lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0467—Elements of gearings to be lubricated, cooled or heated
    • F16H57/0476—Electric machines and gearing, i.e. joint lubrication or cooling or heating thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/048—Type of gearings to be lubricated, cooled or heated
    • F16H57/0482—Gearings with gears having orbital motion
    • F16H57/0483—Axle or inter-axle differentials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/048—Type of gearings to be lubricated, cooled or heated
    • F16H57/0493—Gearings with spur or bevel gears 
    • F16H57/0495—Gearings with spur or bevel gears  with fixed gear ratio
    • 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
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K2001/001—Arrangement or mounting of electrical propulsion units one motor mounted on a propulsion axle for rotating right and left wheels of this axle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H2057/0216—Intermediate shaft supports, e.g. by using a partition wall

Definitions

  • the present invention relates to a unit.
  • Patent Document 1 discloses a vehicle drive device that includes a counter gear mechanism that performs deceleration.
  • a vehicle drive device transmits the output torque of a rotating electric machine to a pair of wheels via a pair of output members to drive the vehicle.
  • a rotating electric machine can be used in combination with a power transmission mechanism such as a speed reduction mechanism or a differential gear.
  • a power transmission mechanism such as a speed reduction mechanism or a differential gear.
  • the present invention was made in view of these problems, and an object of the present invention is to improve the layout of the unit.
  • a unit includes oil, a rotating electric machine, a first gear connected downstream of the rotating electric machine, a second gear meshing with the first gear, and a second gear connected downstream of the second gear.
  • a housing that accommodates a third gear that is meshed with the third gear, a fourth gear that meshes with the third gear, a fifth gear that is connected downstream of the fourth gear, and a sixth gear that meshes with the fifth gear.
  • the rotating electric machine and the first gear are arranged on a first shaft.
  • the second gear and the third gear are arranged on a second shaft.
  • the fourth gear and the fifth gear are arranged on the third axis.
  • the sixth gear is arranged on the fourth axis. When viewed in the axial direction, the first axis and the fourth axis are arranged below the second axis and the third axis.
  • the diameter of each gear can be reduced in realizing a predetermined gear ratio.
  • by arranging the layout in which the first and fourth axes are concentrated on the lower side in the direction of gravity it becomes easier to guide oil scattered by the rotation of the sixth gear, which is a gear on the downstream side, to the rotating electric machine side. This provides a layout that allows for appropriate oil lubrication.
  • FIG. 1 is a schematic configuration diagram of a unit according to this embodiment.
  • FIG. 2 is an external view of the unit.
  • FIG. 3 is an external view of the unit with the second cover removed.
  • FIG. 4 is a view of the unit viewed from the speed reduction mechanism side with the second cover removed.
  • FIG. 1 is a schematic configuration diagram of a unit 100 according to this embodiment.
  • FIG. 2 is an external view of the unit 100.
  • FIG. 3 is an external view of the unit 100 with the second cover 12 removed.
  • FIG. 4 is a view of the unit 100 viewed from the speed reduction mechanism 30 side with the second cover 12 removed.
  • the direction perpendicular to the paper surface corresponds to the direction of gravity.
  • the vertical direction corresponds to the direction of gravity.
  • the unit can also be referred to as, for example, a motor unit (a unit that has at least a motor) or a power transmission device (a device that has at least a power transmission mechanism).
  • the motor is a rotating electric machine having an electric motor function and/or a generator function (at least one of the electric motor function and the generator function).
  • the power transmission mechanism is, for example, a gear mechanism and/or a differential gear mechanism.
  • a device (unit) having a motor and a power transmission mechanism is included in the concepts of both a motor unit and a power transmission device.
  • the unit 100 includes a housing 10, a rotating electrical machine 20, a speed reduction mechanism 30, and a differential gear 40.
  • the unit 100 is mounted on a vehicle, and the vehicle is an electric vehicle.
  • the housing 10 has a first cover 11, a second cover 12, and a case 13.
  • the rotating electric machine 20, the speed reduction mechanism 30, and the differential gear 40 are housed in the housing 10.
  • the first cover 11 closes the opening of the cylindrical case 13 from one side in the axial direction (the left side in FIG. 1)
  • the second cover 12 closes the opening of the case 13 from the other side in the axial direction.
  • the rotating electrical machine 20 is housed within the case 13, and the differential gear 40 is housed within the second cover 12.
  • the unit 100 further includes an inverter 70.
  • Inverter 70 is provided on the outer wall of case 13.
  • Inverter 70 may be provided within case 13.
  • Inverter 70 is provided close to rotating electrical machine 20 .
  • the inverter 70 is provided above the rotating electric machine 20.
  • Above and below mean, for example, an arrangement that appears to overlap in the direction of gravity when viewed in a predetermined direction, including an axial view and a radial view. For example, when the first element overlaps the second element in the direction of gravity when viewed in the axial direction, if the first element is higher than the second element, the first element is above the second element. In this case, the first element and the second element may overlap or may be offset when viewed in the radial direction.
  • the unit 100 has an oil OL.
  • the oil OL is supplied from outside the housing 10 to the rotating electrical machine 20 inside the case 13 to lubricate the rotating electrical machine 20.
  • a part of the oil OL supplied to the rotating electric machine 20 is stored in the housing 10 and accommodated in the housing 10 .
  • the remaining oil OL is discharged outside the housing 10.
  • the oil OL can be used by being circulated inside and outside the housing 10.
  • the case 13 has a through hole 13a.
  • the through hole 13a is formed in the case 13 at a portion below the first axis AX1 and the fourth axis AX4 in the gravity direction, and communicates the inside of the second cover 12 and the inside of the case 13. Therefore, the oil OL in the case 13 can flow into the second cover 12 through the through hole 13a, and is also used to lubricate the differential gear 40. Oil reservoirs are formed inside the second cover 12 and the case 13 in the lower portion in the direction of gravity.
  • the oil level LV of the oil reservoir overlaps, for example, the through hole 13a when viewed in the axial direction in the steady circulation state, so that the oil level LV common to the oil reservoir in the second cover 12 and the oil reservoir in the case 13 in the steady circulation state. considered to be high.
  • the steady circulation state is a state in which the circulation of the oil OL is steady.
  • the oil level LV is stabilized during pump operation.
  • the oil circulation may be performed by scooping up the oil OL using a rotating member such as a gear within the housing 10.
  • the steady circulation state is a state in which the oil level LV is stabilized while the rotating member is rotating.
  • the oil level LV is set at a height such that the stator 22 is immersed in the oil OL in the steady circulation state, and the oil OL does not enter the gap (air gap) between the rotor 21 and the stator 22. This is because when the oil OL enters the air gap, the rotational resistance of the rotating electric machine 20 increases rapidly, while the stator 22 is desired to be cooled. From this, the oil level LV is set as described above so that the oil OL comes into contact with the coil end of the stator 22.
  • the rotating electric machine 20 includes a rotor 21, a stator 22, and a rotating shaft 23, and constitutes a drive source for the vehicle.
  • the rotor 21 is provided on the outer periphery of the rotating shaft 23.
  • the stator 22 is provided in the case 13 and houses the rotor 21.
  • the rotating shaft 23 protrudes from the rotor 21 toward both sides in the axial direction.
  • the rotating shaft 23 passes through the first cover 11 at one end in the axial direction and through the case 13 at the other end in the axial direction.
  • a bearing 51 is provided on the first cover 11 in the portion through which the rotating shaft 23 passes, a bearing 52 is provided in the case 13 in the portion through which the rotating shaft 23 passes, and the rotating shaft 23 is supported by the bearing 51 and the bearing 52.
  • a resolver 80 is provided on the rotating shaft 23 in a portion protruding from the first cover 11 . Resolver 80 detects rotation of rotating electrical machine 20 .
  • the speed reduction mechanism 30 is a gear mechanism, and includes a first gear 31, a second gear 32, a third gear 33, a fourth gear 34, a fifth gear 35, a sixth gear 36, a shaft 37, and a shaft 38.
  • the first gear 31 is arranged on the first axis AX1 together with the rotating electric machine 20.
  • the rotating electrical machine 20 and the first gear 31 are coaxially arranged with respect to the first axis AX1. That is, the fact that a plurality of elements (parts, parts, etc.) are arranged on the Nth axis (N is a natural number) is the same as the fact that the plurality of elements are arranged coaxially with the Nth axis.
  • the second gear 32 and the third gear 33 are arranged on the second axis AX2, and the fourth gear 34 and the fifth gear 35 are arranged on the third axis AX3.
  • the sixth gear 36 and the differential gear 40 are arranged on the fourth axis.
  • the first axis AX1, the second axis AX2, the third axis AX3, and the fourth axis AX4 all constitute the axes of the unit 100 and extend along the same direction. Therefore, the extending directions of the first axis AX1, the second axis AX2, the third axis AX3, and the fourth axis AX4 all correspond to the axial direction of the unit 100.
  • the axial direction means the axial direction of the rotating shaft of the parts (for example, a motor, a gear mechanism, or a differential gear mechanism) that constitute the unit.
  • the radial direction of the unit 100 is a direction perpendicular to any one of the first axis AX1, the second axis AX2, the third axis AX3, and the fourth axis AX4.
  • the first axis AX1 constitutes the axis of the rotating shaft 23
  • the second axis AX2 constitutes the axis of the shaft 37
  • the third axis AX3 constitutes the axis of the shaft 38
  • the fourth axis AX4 constitutes the axis of the differential gear 40.
  • the first gear 31 is connected downstream of the rotating electric machine 20.
  • the downstream side is the power output side, and the rotor 21 and stator 22 that generate power are used as references for the rotating electric machine 20. Therefore, in other words, the downstream of the rotating electric machine 20 can also be said to be the downstream of the stator 22.
  • the rotating shaft 23 may not be understood as a component of the rotating electric machine 20.
  • the downstream side is the power output side, whereas the upstream side is the power input side.
  • the first gear 31 is connected downstream of the rotating electric machine 20 so as to be able to transmit power.
  • the connection may be through other arrangements (eg, a clutch or other gear mechanism).
  • the first gear 31 is provided on the other side of the rotor 21 in the axial direction, and is provided on the rotating shaft 23 at a portion protruding from the case 13 .
  • the first gear 31 is press-fitted onto the rotating shaft 23 and is integrated with the first gear 31 .
  • the second gear 32 meshes with the first gear 31.
  • the second gear 32 is set to have a larger number of teeth than the first gear 31, and together with the first gear 31 constitutes a first reduction gear stage.
  • the second gear 32 is provided on the shaft 37 and arranged on the second axis AX2.
  • the second gear 32 is integrally formed with the shaft 37.
  • Shaft 37 extends along axis of rotation 23 .
  • the shaft 37 is supported by a bearing 53 provided on the case 13 and a bearing 54 provided on the second cover 12.
  • the bearing 53 and the bearing 54 are arranged at both ends of the shaft 37.
  • the third gear 33 is connected downstream of the second gear 32.
  • the third gear 33 is provided on the shaft 37 and arranged on the second axis AX2.
  • the third gear 33 is provided on the shaft 37 at a portion extending further away from the rotating electrical machine 20 than the second gear 32, that is, toward the other axial side.
  • the third gear 33 is integrally formed with the shaft 37.
  • the second gear 32 and the third gear 33 are arranged between the bearing 53 and the bearing 54 in the axial direction.
  • the fourth gear 34 meshes with the third gear 33.
  • the fourth gear 34 is set to have a larger number of teeth than the third gear 33, and together with the third gear 33 constitutes a second reduction gear stage.
  • the fourth gear 34 is provided on the shaft 38 and arranged on the third axis AX3.
  • the fourth gear 34 is integrally formed with the shaft 38.
  • Shaft 38 extends along axis of rotation 23 .
  • the shaft 38 is supported by a bearing 55 provided on the case 13 and a bearing 56 provided on the second cover 12.
  • the bearing 55 and the bearing 56 are arranged at both ends of the shaft 38.
  • the fifth gear 35 is connected downstream of the fourth gear 34.
  • the fifth gear 35 is provided on the shaft 38 and arranged on the third axis AX3.
  • the fifth gear 35 is provided on the shaft 38 at a portion extending in a direction closer to the rotating electric machine 20 than the fourth gear 34, that is, toward one side in the axial direction. Therefore, in the shaft 38, the power transmission direction is turned back to the opposite side in the axial direction with respect to the shaft 37.
  • the fifth gear 35 is integrally formed with the shaft 38.
  • the fourth gear 34 and the fifth gear 35 are arranged between the bearing 55 and the bearing 56 in the axial direction.
  • the sixth gear 36 meshes with the fifth gear 35.
  • the sixth gear 36 is a final gear and is provided in the differential gear 40.
  • the sixth gear 36 and the differential gear 40 are arranged on the fourth axis AX4. Power from the rotating electric machine 20 is transmitted from the sixth gear 36 to the differential gear 40. Therefore, the differential gear 40 is connected downstream of the sixth gear 36.
  • the sixth gear 36 overlaps the first gear 31 when viewed in the radial direction.
  • the first gear 31 has a portion that overlaps the sixth gear 36 when viewed in the radial direction.
  • this portion overlaps with the sixth gear 36 when viewed in the radial direction along a plane including the first axis AX1 and the fourth axis AX4.
  • Overlapping in a predetermined direction including a radial view and an axial view means overlapping in a predetermined direction, and means that a plurality of elements are lined up in a predetermined direction. From this, if a drawing shows multiple elements lined up in a predetermined direction, it can be assumed that there is a sentence in the specification explaining that multiple elements overlap when viewed in a predetermined direction. .
  • the power transmission direction is turned around the shaft 38 to the opposite side in the axial direction with respect to the shaft 37, as described above. Therefore, by overlapping the sixth gear 36 with the first gear 31 when viewed in the radial direction, the axial dimension can be reduced.
  • the sixth gear 36 is set to have a larger number of teeth than the fifth gear 35, and together with the fifth gear 35 constitutes a third reduction gear stage. Therefore, in the deceleration mechanism 30, the first gear 31 and the second gear 32, the third gear 33 and the fourth gear 34, and the fifth gear 35 and the sixth gear 36 perform three stages of deceleration. This makes it possible to make the diameter of the reduction gear smaller in order to secure the reduction ratio compared to the case where the reduction is performed in one step or even in two steps. As a result, layout constraints such as the restriction on making the unit 100 more compact due to the necessity of ensuring a distance between the shafts corresponding to the large diameter of the reduction gear are relaxed.
  • three gear stages can be formed by the four axes from the first axis AX1 to the fourth axis AX4, and the number of gear stages can be increased compared to the case where one-step shifting or two-stage shifting is performed.
  • the diameter of each gear can be reduced in order to achieve a predetermined speed ratio.
  • the third gear 33 and the fourth gear 34 are arranged in a direction farther from the stator 22 than the first gear 31, the second gear 32, the fifth gear 35, and the sixth gear 36.
  • four gears, the first gear 31, the second gear 32, the fifth gear 35, and the sixth gear 36, are moved toward the stator 22, and the remaining two gears, the third gear 33 and the fourth gear 34, are moved toward the stator 22. It is moved to the side away from 22.
  • a space is formed around the two gears, that is, on the end side of the unit 100. Therefore, it is possible to reduce the size of the unit 100 by recessing the end thereof, or to arrange members in a space on the end side of the unit 100, thereby increasing the degree of freedom in layout.
  • the differential gear 40 is a differential gear mechanism and includes a differential case 41 and a differential portion 42.
  • the differential case 41 is supported by a bearing 57 provided on the case 13 and a bearing 58 provided on the second cover 12, and rotates together with the sixth gear 36.
  • the sixth gear 36 is coaxially fixed to the outer wall of the differential case 41, and the differential case 41 accommodates the differential portion 42.
  • the differential unit 42 distributes the power input to the differential case 41 via the sixth gear 36 to the drive wheels in the left and right directions of the vehicle and outputs the divided power.
  • the differential gear 40 protrudes in a direction away from the stator 22 relative to the sixth gear 36.
  • the differential gear 40 protrudes in this manner with a portion that protrudes further in the axial direction from the sixth gear 36 as a protrusion. Therefore, in other words, the differential gear 40 protrudes further away from the stator 22 than toward the sixth gear 36, and is arranged closer to the sixth gear 36 in the direction away from the stator 22.
  • the differential gear 40 is arranged in a space on the end side of the unit 100 that is formed according to the gear arrangement of the speed reduction mechanism 30. For this reason, it is preferable to make the unit 100 more compact by reducing the axial dimension of the reduction mechanism 30 as described above and by reducing the gear diameter by adopting three-stage reduction. It is planned to As a result, the layout of the unit 100 is further improved.
  • the bearings 57 and 58 are arranged on both sides of the differential gear 40 in the axial direction.
  • the bearing 53, the bearing 55, and the bearing 57 are arranged on one axial side
  • the bearing 54, the bearing 56, and the bearing 58 are arranged on the other axial side. Therefore, the rigidity of the housing 10 can be easily ensured, which is advantageous in terms of sound and vibration performance.
  • the bearing holding holes can be machined simultaneously on one axial side and the other axial side, alignment between the three rotating members of the shaft 37, the shaft 38, and the differential gear 40 becomes easier.
  • a first drive shaft 61 is assembled to the differential portion 42 from one axial side, and a second drive shaft 62 is assembled from the other axial side. Power from the rotating electrical machine 20 is transmitted from the differential section 42 to one drive wheel via the first drive shaft 61 and to the other drive wheel via the second drive shaft 62.
  • the first drive shaft 61 is longer than the second drive shaft 62, thereby increasing the distance between the drive wheels and the differential gear 40, thereby suppressing the bending angle.
  • the first drive shaft 61 is supported by a bearing 59 provided on the first cover 11.
  • the sixth gear 36 can also be understood as a part of the differential gear 40.
  • the sixth gear 36 can also be understood as one component of the differential gear 40.
  • a portion of the differential gear 40 including the differential section 42 that outputs the power from the rotating electric machine 20 is connected downstream of the sixth gear 36, and the differential gear 40 is connected downstream of the sixth gear 36. It can be understood that it is being done.
  • the first axis AX1 and the fourth axis AX4 are arranged below the second axis AX2 and the third axis AX3 when viewed in the axial direction.
  • the upper side and the lower side mean a vertical relationship in the direction of gravity when viewed in a predetermined direction including an axial view and a radial view, and include upper and lower sides. With respect to the upper side and the lower side, the upper side and the lower side further include a positional relationship that is diagonally above and diagonally below when viewed in a predetermined direction including an axial direction and a radial direction.
  • the first element when viewed in the axial direction, the first element is located diagonally above the second element without overlapping the second element in the direction of gravity, and when viewed in the radial direction, the first element and the second element do not overlap.
  • the first element is on the upper side of the second element.
  • the first axis AX1 and the fourth axis AX4 are arranged in a layout where they are concentrated on the lower side in the direction of gravity in the unit 100. This makes it easier to guide the oil OL scattered by the rotation of the sixth gear 36, which is the gear on the downstream side, to the rotating electric machine 20 side, resulting in a layout that allows appropriate oil lubrication.
  • the oil OL can be led to the rotating electrical machine 20 side through the through hole 13a as shown by the arrow in FIG.
  • the rotating electrical machine 20 disposed on the first axis AX1 is disposed on the lower side in the direction of gravity, it is possible to provide a space above the rotating electrical machine 20. Therefore, it becomes possible to arrange the inverter 70 above the rotating electrical machine 20 and bring it close to the rotating electrical machine 20 while suppressing an increase in the radial dimension. As a result, the unit 100 is more compact and the layout of the unit 100 is improved, compared to, for example, a case where the rotating electrical machine 20 is placed above in the direction of gravity and the inverter 70 is placed above it.
  • the gear diameter is reduced by adopting the three-stage deceleration, and as a result, layout constraints are relaxed. Therefore, by arranging the rotating electric machine 20 and the differential gear 40, it becomes easy to appropriately set the relative oil level height of the oil reservoir with respect to each.
  • the oil level can be adjusted more appropriately by increasing the oil level in the oil reservoir in the second cover 12 relative to the differential gear 40 (thereby lowering the position of the differential gear 40). Can be set. Furthermore, in order to suppress oil OL from entering the air gap between the rotor 21 and stator 22 for the rotating electric machine 20, the height of the oil level in the oil reservoir in the case 13 is relatively lowered (therefore, the rotation By raising the position of the electric machine 20), the oil level height can be set more appropriately. From this point of view, in the unit 100, the first axis AX1 is arranged above the fourth axis AX4.
  • the unit 100 includes an oil OL, a rotating electric machine 20, a first gear 31 connected downstream of the rotating electric machine 20, a second gear 32 meshing with the first gear 31, and a downstream side of the second gear 32.
  • It has a housing 10 for accommodating it.
  • the rotating electric machine 20 and the first gear 31 are arranged on the first axis AX1.
  • the second gear 32 and the third gear 33 are arranged on the second axis AX2.
  • the fourth gear 34 and the fifth gear 35 are arranged on the third axis AX3.
  • the sixth gear 36 is arranged on the fourth axis AX4. When viewed in the axial direction, the first axis AX1 and the fourth axis AX4 are arranged below the second axis AX2 and the third axis AX3.
  • the diameter of each gear can be reduced in realizing a predetermined gear ratio.
  • the oil OL scattered by the rotation of the sixth gear 36 which is the gear on the downstream side, is removed from the rotating electric machine 20 as described above. It becomes easier to lead to the side. This provides a layout that allows for appropriate oil lubrication.
  • the first gear 31 has a portion that overlaps with the sixth gear 36 when viewed in the radial direction. According to such a configuration, the axial dimension can be shortened compared to the case where the differential gear 40 is reversed in the axial direction with respect to the third gear 33 and the fourth gear 34, and contributes to shortening the axial dimension. .
  • the third gear 33 and the fourth gear 34 are arranged in a direction further away from the stator 22 than the first gear 31, the second gear 32, the fifth gear 35, and the sixth gear 36.
  • a space is created around the two gears, the third gear 33 and the fourth gear 34, that is, on the end side of the unit 100. Therefore, it is possible to make the unit 100 smaller by recessing the end side, or to arrange another member in the space on the end side of the unit 100, increasing the degree of freedom in layout. .
  • the unit 100 has a differential gear 40 connected downstream of the sixth gear 36.
  • the differential gear 40 is arranged on the fourth axis AX4. Differential gear 40 projects in a direction away from stator 22 relative to sixth gear 36 . According to such a configuration, since the differential gear 40 is arranged in the space on the end side of the unit 100, the unit 100 can be suitably made compact, and the degree of freedom in layout can be further increased.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
PCT/JP2023/017854 2022-06-13 2023-05-12 ユニット Ceased WO2023243277A1 (ja)

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JP2024528385A JP7676667B2 (ja) 2022-06-13 2023-05-12 ユニット
US18/873,587 US20250361933A1 (en) 2022-06-13 2023-05-12 Unit
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EP4538559A4 (en) 2025-09-24
JP7676667B2 (ja) 2025-05-14
EP4538559A1 (en) 2025-04-16
CN119343548A (zh) 2025-01-21
US20250361933A1 (en) 2025-11-27

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