WO2022074996A1 - Dispositif - Google Patents

Dispositif Download PDF

Info

Publication number
WO2022074996A1
WO2022074996A1 PCT/JP2021/032966 JP2021032966W WO2022074996A1 WO 2022074996 A1 WO2022074996 A1 WO 2022074996A1 JP 2021032966 W JP2021032966 W JP 2021032966W WO 2022074996 A1 WO2022074996 A1 WO 2022074996A1
Authority
WO
WIPO (PCT)
Prior art keywords
oil
rotation axis
motor
gear
hole
Prior art date
Application number
PCT/JP2021/032966
Other languages
English (en)
Japanese (ja)
Inventor
俊一 忍足
Original Assignee
ジヤトコ株式会社
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 ジヤトコ株式会社 filed Critical ジヤトコ株式会社
Publication of WO2022074996A1 publication Critical patent/WO2022074996A1/fr

Links

Images

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
    • 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
    • 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 an apparatus.
  • Patent Document 1 discloses a device for oil-cooling the stator of a rotary electric machine by arranging the stator of the rotary electric machine in the same room as the gear mechanism.
  • the apparatus is With a rotary electric machine, It has a storage chamber to which oil is supplied and which encloses at least a part of the coil end of the stator of the rotary electric machine.
  • the cooling efficiency of the stator of the rotary electric machine can be improved.
  • FIG. 1 is a skeleton diagram of a power transmission device.
  • FIG. 2 is a schematic cross-sectional view of the power transmission device.
  • FIG. 3 is an enlarged view around the differential mechanism of the power transmission device.
  • FIG. 4 is an enlarged view around the differential mechanism of the power transmission device.
  • FIG. 5 is an exploded perspective view of the differential mechanism of the power transmission device.
  • FIG. 6 is a diagram illustrating an oil catch portion.
  • FIG. 7 is a diagram illustrating an oil catch portion.
  • FIG. 8 is a diagram illustrating an oil catch portion.
  • FIG. 9 is a diagram illustrating an oil catch portion.
  • FIG. 10 is a diagram illustrating an oil catch portion.
  • FIG. 11 is a diagram illustrating an oil catch portion.
  • FIG. 12 is a diagram illustrating the flow of oil around the motor.
  • FIG. 13 is an enlarged view of a main part of the cover member.
  • FIG. 14 is a diagram illustrating the flow of oil around the coil end.
  • FIG. 15 is a diagram illustrating a partition wall.
  • FIG. 16 is an enlarged view of a main part of the cover member.
  • FIG. 17 is a diagram illustrating the flow of oil around the coil end.
  • FIG. 18 is a diagram illustrating a power transmission device according to a modified example.
  • FIG. 19 is an enlarged view of a main part of the power transmission device according to the modified example.
  • FIG. 20 is an enlarged view of a main part of the power transmission device according to the modified example.
  • FIG. 21 is a diagram illustrating the flow of oil around the coil end.
  • FIG. 22 is a diagram illustrating the flow of oil around the coil end.
  • FIG. 23 is a diagram illustrating a partition wall.
  • the second element (part, part, etc.) connected to the first element (part, part, etc.) and the second element (part, part, etc.) connected downstream of the first element (part, part, etc.) Etc.), the second element (parts, parts, etc.) connected upstream of the first element (parts, parts, etc.) means that the first element and the second element are connected so as to be able to transmit power. Means.
  • the power input side is upstream and the power output side is downstream.
  • the first element and the second element may be connected via other elements (clutch, other gear mechanism, etc.).
  • “Overlapping when viewed from a predetermined direction” means that a plurality of elements are lined up in a predetermined direction, and is synonymous with the case of describing "overlapping in a predetermined direction".
  • the "predetermined direction” is, for example, an axial direction, a radial direction, a gravity direction, a vehicle traveling direction (vehicle forward direction, vehicle reverse direction), and the like.
  • not overlapping when viewed from a predetermined direction and “offset when viewed from a predetermined direction” mean that a plurality of elements are not arranged in a predetermined direction, and "overlap in a predetermined direction". It is synonymous with the case of describing "not” or “offset in a predetermined direction”.
  • the "predetermined direction” is, for example, an axial direction, a radial direction, a gravity direction, a vehicle traveling direction (vehicle forward direction, vehicle reverse direction), and the like.
  • the first element (part, part, etc.) is located between the second element (part, part, etc.) and the third element (part, part, etc.) when viewed from a predetermined direction," is observed from the predetermined direction. This means that it can be observed that the first element is between the second element and the third element.
  • the "predetermined direction" is an axial direction, a radial direction, a gravity direction, a vehicle traveling direction (vehicle forward direction, vehicle reverse direction), and the like.
  • vehicle forward direction vehicle reverse direction
  • the first element is between the second element and the third element when viewed from the radial direction. It can be said that it is located in.
  • the first element is between the second element and the third element when viewed from a predetermined direction
  • the first element is the second element when viewed from a predetermined direction in the description of the specification. It can be considered that there is a sentence explaining that it is between the element and the third element.
  • Axial direction means the axial direction of the rotating shaft of the parts constituting the power transmission device.
  • the "radial direction” means a direction orthogonal to the axis of rotation of the components constituting the power transmission device.
  • the parts are, for example, a motor, a gear mechanism, a differential gear mechanism, and the like.
  • FIG. 1 is a skeleton diagram illustrating a power transmission device 1 according to the present embodiment.
  • FIG. 2 is a schematic cross-sectional view illustrating the power transmission device 1 according to the present embodiment.
  • FIG. 3 is an enlarged view around the planetary reduction gear 4 of the power transmission device 1.
  • FIG. 4 is an enlarged view of the power transmission device 1 around the differential mechanism 5.
  • the vertical direction will be described as meaning up and down in the vertical VL direction with respect to the power transmission device 1 mounted on the electric vehicle EV.
  • the power transmission device 1 includes a motor 2, a gear mechanism 3 that transmits the output rotation of the motor 2 to a drive shaft DA and a DB (drive shaft), and a park lock mechanism PL.
  • the "motor” is a rotary electric machine having an electric machine function and / or a generator function.
  • a park lock mechanism PL, a gear mechanism 3, a drive shaft DA, and a DB are provided along a transmission path of output rotation around the rotation axis X of the motor 2.
  • the output rotation of the motor 2 is transmitted to the drive shafts DA and DB via the gear mechanism 3.
  • the left and right drive wheels W and W are driven.
  • the gear mechanism 3 is composed of a planetary reduction gear 4 (reduction mechanism) and a differential mechanism 5 (differential gear).
  • the planetary reduction gear 4 is connected to the downstream side of the motor 2.
  • the differential mechanism 5 is connected downstream of the planetary reduction gear 4.
  • a drive shaft DA and a DB are connected to the downstream of the differential mechanism 5.
  • the planetary reduction gear 4 decelerates the output rotation of the motor 2 and inputs it to the differential mechanism 5.
  • the differential mechanism 5 transmits the rotation input from the planetary reduction gear 4 to the drive shafts DA and DB.
  • the main body box 10 of the power transmission device 1 has a first box 11 for accommodating the motor 2 and a second box 12 externally attached to the first box 11.
  • the main body box 10 has a third box 13 assembled to the first box 11 and a fourth box 14 assembled to the second box 12.
  • the first box 11 has a cylindrical support wall portion 111, a flange-shaped joint portion 112 formed at one end 111a of the support wall portion 111, and a tubular fitting formed at the other end 111b of the support wall portion 111. It has a joint portion 113 and.
  • the first box 11 is arranged so that the center line of the support wall portion 111 is oriented along the rotation axis X of the motor 2.
  • the motor 2 is housed inside the support wall portion 111.
  • the joint portion 112 projects outward from the support wall portion 111 in the radial direction of the rotation axis X.
  • the fitting portion 113 has an outer diameter smaller than that of the support wall portion 111.
  • the second box 12 includes a cylindrical peripheral wall portion 121, a flange-shaped joint portion 122 provided at one end 121a of the peripheral wall portion 121, and a flange-shaped joint portion 123 provided at the other end 121b of the peripheral wall portion 121. ,have.
  • the peripheral wall portion 121 is formed with an inner diameter that can be extrapolated to the support wall portion 111 of the first box 11.
  • the first box 11 and the second box 12 are assembled to each other by externally inserting the peripheral wall portion 121 of the second box 12 to the support wall portion 111 of the first box 11.
  • the fitting portion 113 of the support wall portion 111 is internally fitted in the peripheral wall portion 121.
  • the joint portion 122 on the one end 121a side of the peripheral wall portion 121 is in contact with the joint portion 112 of the first box 11 from the rotation axis X direction. These joints 122 and 112 are connected to each other by bolts (not shown).
  • a plurality of concave grooves 111c are provided on the outer periphery of the support wall portion 111.
  • the plurality of concave grooves 111c are provided at intervals in the rotation axis X direction.
  • Each of the concave grooves 111c is provided over the entire circumference in the circumferential direction around the rotation axis X.
  • the peripheral wall portion 121 of the second box 12 is externally inserted into the support wall portion 111 of the first box 11.
  • the opening of the concave groove 111c is closed by the peripheral wall portion 121.
  • a plurality of cooling passage CPs through which coolant flows are formed between the support wall portion 111 and the peripheral wall portion 121.
  • the "coolant” is a refrigerant, for example, a liquid (cooling water or the like), a gas (air or the like) or the like.
  • ring grooves 111d and 111d are formed on both sides of the region where the concave groove 111c is provided.
  • Seal rings 114 and 114 are fitted and attached to the ring grooves 111d and 111d. These seal rings 114 are pressed against the inner circumference of the peripheral wall portion 121 extrapolated to the support wall portion 111 to seal the gap between the outer circumference of the support wall portion 111 and the inner circumference of the peripheral wall portion 121.
  • oil holes 170a and 171a are opened on the inner circumference of the support wall portion 111.
  • the oil holes 170a and 171a are open on the inner circumferences of one end 111a side and the other end 111b side of the support wall portion 111 in the rotation axis X direction.
  • the other end 121b of the second box 12 is provided with a wall portion 120 extending toward the inner diameter side.
  • the wall portion 120 is provided in a direction orthogonal to the rotation axis X from the peripheral wall portion 121.
  • An opening 120a through which the drive shaft DA is inserted is provided in a region of the wall portion 120 that intersects the rotation axis X.
  • a cylindrical motor support portion 125 surrounding the opening 120a is provided on the surface on the motor 2 side (right side in the drawing).
  • the motor support portion 125 is inserted inside the coil end 253b described later.
  • the motor support portion 125 faces the end portion 21b of the rotor core 21 with a gap in the rotation axis X direction.
  • the peripheral wall portion 121 of the second box 12 has a radial thickness in the lower region thicker than that in the upper region in the vertical direction with respect to the mounted state of the power transmission device 1 on the electric vehicle EV. ..
  • An oil reservoir 128 that penetrates the second box 12 in the X direction of the rotation axis is formed in this radialally thick region.
  • the oil pool portion 128 communicates with the space inside the first box 11 (motor chamber Sa) via the oil passages 180 and 181 at one end 121a side and the other end 121b side of the peripheral wall portion 121 in the rotation axis X direction. ..
  • the oil passage 180 is composed of an oil hole 180a provided in the support wall portion 111 of the first box 11 and an oil hole 180b provided in the peripheral wall portion 121 of the second box 12.
  • the oil passage 181 is composed of an oil hole 181a provided in the support wall portion 111 of the first box 11 and an oil hole 181b provided in the peripheral wall portion 121 of the second box 12.
  • the oil passages 180 and 181 are formed so as to penetrate the support wall portion 111 of the first box 11 and the peripheral wall portion 121 of the second box 12 in the vertical direction, respectively.
  • the third box 13 has a wall portion 130 orthogonal to the rotation axis X.
  • a joint portion 132 forming a ring shape when viewed from the rotation axis X direction is provided on the outer peripheral portion of the wall portion 130.
  • the third box 13 is located on the opposite side (right side in the figure) of the differential mechanism 5 when viewed from the first box 11.
  • the joint portion 132 of the third box 13 is joined to the joint portion 112 of the first box 11 from the rotation axis X direction.
  • the third box 13 and the first box 11 are connected to each other by bolts (not shown). In this state, in the first box 11, the opening of the support wall portion 111 on the joint portion 122 side (right side in the drawing) is closed by the third box 13.
  • an insertion hole 130a for the drive shaft DA is provided in the central portion of the wall portion 130.
  • a lip seal RS is fixed to the inner circumference of the insertion hole 130a.
  • a lip portion (not shown) is elastically brought into contact with the outer periphery of the drive shaft DA.
  • the gap between the inner circumference of the insertion hole 130a and the outer circumference of the drive shaft DA is sealed by the lip seal RS.
  • a peripheral wall portion 131 surrounding the insertion hole 130a is provided on the surface of the wall portion 130 on the first box 11 side (left side in the drawing).
  • a drive shaft DA is supported on the inner circumference of the peripheral wall portion 131 via a bearing B4.
  • the motor support portion 135 is arranged on the motor 2 side (left side in the drawing) when viewed from the peripheral wall portion 131.
  • the motor support portion 135 has a cylindrical shape that surrounds the rotation shaft X at intervals.
  • a cylindrical connection wall 136 is connected to the outer periphery of the motor support portion 135.
  • the connecting wall 136 is formed with an outer diameter larger than that of the peripheral wall portion 131 on the wall portion 130 side (right side in the drawing).
  • the connection wall 136 is integrally formed with the motor support portion 135.
  • the connecting wall 136 is provided so as to be oriented along the rotation axis X.
  • the connecting wall 136 extends along the rotation axis X in a direction away from the motor 2.
  • the tip end side of the connection wall 136 is fixed to the wall portion 130 of the third box 13 by a bolt (not shown).
  • the motor support portion 135 is supported by the third box 13 via the connection wall 136.
  • One end 20a side of the motor shaft 20 penetrates the inside of the motor support portion 135 from the motor 2 side to the peripheral wall portion 131 side.
  • a bearing B1 is supported on the inner circumference of the motor support portion 135.
  • the outer circumference of the motor shaft 20 is supported by the motor support portion 135 via the bearing B1.
  • a through hole 136a is formed in the lower region of the connection wall 136 in the vertical direction so as to penetrate the connection wall 136 in the radial direction of the rotation axis X.
  • the space inside the connection wall 136 and the motor chamber Sa communicate with each other through the through hole 136a.
  • the fourth box 14 has a peripheral wall portion 141 surrounding the outer periphery of the planetary reduction gear 4 and the differential mechanism 5, and a flange-shaped joint portion 142 formed at the end portion of the peripheral wall portion 141 on the second box 12 side. are doing.
  • the fourth box 14 is located on the differential mechanism 5 side (left side in the figure) when viewed from the second box 12.
  • the joint portion 142 of the fourth box 14 is joined to the joint portion 123 of the second box 12 from the rotation axis X direction.
  • the fourth box 14 and the second box 12 are connected to each other by bolts (not shown).
  • the inside of the main body box 10 of the power transmission device 1 is divided into a motor chamber Sa accommodating the motor 2 and a gear chamber Sb accommodating the gear mechanism 3 (planetary reduction gear 4 and the differential mechanism 5) by the wall portion 120.
  • the wall portion 120 constitutes a partition wall provided between the gear mechanism 3 and the motor 2.
  • the motor chamber Sa is formed inside the first box 11 between the wall portion 120 of the second box 12 and the wall portion 130 of the third box 13.
  • the motor chamber Sa communicates with the oil reservoir 128 via the oil passages 180 and 181 described above in the lower region in the vertical direction.
  • the gear chamber Sb is formed on the inner diameter side of the fourth box 14 between the wall portion 120 of the second box 12 and the peripheral wall portion 141 of the fourth box 14.
  • the gear chamber Sb communicates with the oil reservoir 128 described above in the lower region in the vertical direction.
  • Oil OL is sealed in the motor chamber Sa and the gear chamber Sb of the main body box 10 (see FIG. 2).
  • the oil OL in the motor chamber Sa is cooled by heat exchange with the coolant flowing through the cooling path CP, and also cools the motor 2.
  • the oil OL is made of a material different from that of the coolant.
  • the oil OL in the gear chamber Sb lubricates the gear mechanism 3 and cools the gear mechanism 3.
  • the motor chamber Sa and the gear chamber Sb communicate with each other inside the main body box 10, and the oil level of the oil OL in the motor chamber Sa and the gear chamber Sb is the same.
  • a plate member PT is arranged inside the gear chamber Sb.
  • the plate member PT is fixed to the fourth box 14 with bolts B.
  • the plate member PT divides the gear chamber Sb into a first gear chamber Sb1 accommodating the planetary reduction gear 4 and the differential mechanism 5, and a second gear chamber Sb2 accommodating the park lock mechanism PL.
  • the second gear chamber Sb2 is located between the first gear chamber Sb1 and the motor chamber Sa in the X direction of the rotation axis.
  • the motor 2 has a motor shaft 20, a rotor core 21 (rotor), and a stator core 25 (stator).
  • the motor shaft 20 has a cylindrical shape.
  • the drive shaft DA is arranged so as to penetrate the inner circumference of the motor shaft 20.
  • the rotor core 21 has a cylindrical shape and is externally attached to the motor shaft 20.
  • the stator core 25 is a fixed body located on the radial outer side of the rotor core 21.
  • the stator core 25 surrounds the outer circumference of the rotor core 21 at intervals.
  • bearings B1 and B1 are extrapolated and fixed on both sides of the rotor core 21.
  • the bearing B1 located on the one end 20a side (right side in the drawing) of the motor shaft 20 when viewed from the rotor core 21 is supported on the inner circumference of the motor support portion 135 of the third box 13.
  • the bearing B1 located on the other end 20b side is supported by the inner circumference of the cylindrical motor support portion 125 of the second box 12.
  • the motor support portions 135 and 125 are arranged on the inner diameter side of the coil ends 253a and 253b, which will be described later, with one end 21a and the other end 21b of the rotor core 21 facing each other with a gap in the rotation axis X direction. ing.
  • the rotor core 21 is formed by laminating a plurality of silicon steel plates. Each of the silicon steel plates is extrapolated to the motor shaft 20 in a state where the relative rotation with the motor shaft 20 is restricted.
  • the silicon steel plate has a ring shape when viewed from the rotation axis X direction of the motor shaft 20. On the outer peripheral side of the silicon steel plate, magnets of N pole and S pole (not shown) are alternately provided in the circumferential direction around the rotation axis X.
  • the stator core 25 surrounding the outer periphery of the rotor core 21 is formed by laminating a plurality of electromagnetic steel sheets.
  • the stator core 25 is fixed to the inner circumference of the cylindrical support wall portion 111 of the first box 11.
  • the stator core 25 has a yoke portion 251, a teeth portion 252, and a coil 253.
  • the yoke portion 251 has a ring shape and is fixed to the inner circumference of the support wall portion 111.
  • the tooth portion 252 projects from the inner circumference of the yoke portion 251 toward the rotor core 21.
  • the coil 253 is formed by winding a winding (not shown) across a plurality of tooth portions 252.
  • a known copper wire or the like can be used for the winding forming the coil 253.
  • the coil 253 may have a configuration in which windings are distributedly wound around each of a plurality of teeth portions 252 protruding toward the rotor core 21, or a configuration in which winding
  • the length of the coil 253 in the rotation axis X direction is set to be longer than that of the rotor core 21.
  • coil ends 253a and 253b located at both ends of the coil 253 in the rotation axis X direction project from the rotor core 21 in the rotation axis X direction, respectively.
  • the coil ends 253a and 253b have a symmetrical shape with the tooth portion 252 interposed therebetween.
  • the coil ends 253a and 253b of the stator core 25 are covered with cover members 9A and 9B, which will be described later, respectively.
  • the cover members 9A and 9B are made of an insulator such as resin.
  • the wall portion 120 (motor support portion 125) of the second box 12 is provided with an opening 120a.
  • the other end 20b side of the motor shaft 20 penetrates the opening 120a to the differential mechanism 5 side (left side in the drawing) and is located in the fourth box 14.
  • the other end 20b of the motor shaft 20 faces the side gear 54A, which will be described later, with a gap in the rotation axis X direction inside the fourth box 14.
  • a step portion 201 is provided in a region located in the fourth box 14.
  • the step portion 201 is located in the vicinity of the motor support portion 125.
  • the region from the step portion 201 to the vicinity of the other end 20b is a fitting portion 202 provided with a spline on the outer periphery.
  • a park gear Pg and a sun gear 41 are spline-fitted on the outer periphery of the fitting portion 202.
  • One side surface of the park gear Pg in the rotation axis X direction is in contact with the step portion 201.
  • One end 410a of the cylindrical base 410 of the sun gear 41 is in contact with the other side surface of the park gear Pg in the rotation axis X direction.
  • a nut N screwed to the other end 20b of the motor shaft 20 is in pressure contact with the other end 410b of the base portion 410 from the rotation axis X direction.
  • the sun gear 41 and the park gear Pg are provided so as to be non-rotatable with respect to the motor shaft 20 in a state of being sandwiched between the nut N and the step portion 201.
  • the sun gear 41 has a tooth portion 411 on the outer periphery of the motor shaft 20 on the other end 20b side.
  • a large-diameter gear portion 431 of the stepped pinion gear 43 meshes with the outer periphery of the tooth portion 411.
  • the stepped pinion gear 43 has a large-diameter gear portion 431 that meshes with the sun gear 41 and a small-diameter gear portion 432 that has a smaller diameter than the large-diameter gear portion 431.
  • the stepped pinion gear 43 is a gear component in which a large-diameter gear portion 431 and a small-diameter gear portion 432 are integrally provided side by side in the direction of the axis X1 parallel to the rotation axis X.
  • the large-diameter gear portion 431 is formed with an outer diameter R1 larger than the outer diameter R2 of the small-diameter gear portion 432.
  • the stepped pinion gear 43 is provided in a direction along the axis X1.
  • the large-diameter gear portion 431 of the stepped pinion gear 43 is located on the motor 2 side (on the right side in the figure).
  • the outer circumference of the small diameter gear portion 432 meshes with the inner circumference of the ring gear 42.
  • the ring gear 42 has a ring shape that surrounds the rotation shaft X at intervals.
  • a plurality of engaging teeth 421 protruding outward in the radial direction are provided on the outer periphery of the ring gear 42.
  • the plurality of engaging teeth 421 are provided at intervals in the circumferential direction around the rotation axis X.
  • the engaging teeth 421 provided on the outer periphery of the ring gear 42 are spline-fitted to the tooth portions 146a (see FIG. 2) provided on the support wall portion 146 of the fourth box 14.
  • the ring gear 42 is restricted from rotating around the rotation axis X.
  • the stepped pinion gear 43 has a through hole 430 that penetrates the inner diameter side of the large diameter gear portion 431 and the small diameter gear portion 432 in the axis X1 direction.
  • the stepped pinion gear 43 is rotatably supported via needle bearings NB and NB on the outer periphery of the pinion shaft 44 penetrating the through hole 430.
  • a needle bearing NB that supports the inner circumference of the large-diameter gear portion 431 is provided.
  • an in-shaft oil passage 440 is provided inside the pinion shaft 44.
  • the in-shaft oil passage 440 penetrates from one end 44a of the pinion shaft 44 to the other end 44b along the axis X1.
  • the pinion shaft 44 is provided with oil holes 442 and 443 that communicate the in-shaft oil passage 440 and the outer periphery of the pinion shaft 44.
  • the oil hole 443 opens in a region provided with a needle bearing NB that supports the inner circumference of the large-diameter gear portion 431.
  • the oil hole 442 opens in the region where the needle bearing NB that supports the inner circumference of the small diameter gear portion 432 is provided.
  • the oil holes 443 and 442 are open in the region where the stepped pinion gear 43 is extrapolated.
  • the pinion shaft 44 is provided with an introduction path 441 for introducing the oil OL into the in-shaft oil passage 440.
  • the introduction path 441 is open to a region located in the support hole 71a of the second case portion 7, which will be described later.
  • the introduction path 441 communicates the in-shaft oil passage 440 with the outer periphery of the pinion shaft 44.
  • An oil passage 781 in the case is opened on the inner circumference of the support hole 71a.
  • the oil passage 781 in the case communicates the outer periphery of the guide portion 78 protruding from the base portion 71 of the second case portion 7 with the support hole 71a.
  • the oil passage 781 in the case is inclined with respect to the axis X1.
  • the oil passage 781 in the case is inclined toward the slit 710 provided in the base 71 toward the rotation axis X side.
  • the oil OL scraped up by the differential case 50 flows into the oil passage 781 in the case.
  • the oil OL that moves to the outer diameter side due to the centrifugal force due to the rotation of the differential case 50 flows into the oil passage 781 in the case.
  • the oil OL that has flowed from the oil passage 781 in the case into the introduction passage 441 flows into the in-shaft oil passage 440 of the pinion shaft 44.
  • the oil OL that has flowed into the in-shaft oil passage 440 is discharged radially outward from the oil holes 442 and 443.
  • the oil OL discharged from the oil holes 442 and 443 lubricates the needle bearing NB extrapolated to the pinion shaft 44.
  • a through hole 444 is provided on the other end 44b side of the region where the introduction path 441 is provided.
  • the through hole 444 penetrates the pinion shaft 44 in the diameter line direction.
  • the pinion shaft 44 is provided with the through hole 444 and the insertion hole 782 on the second case portion 7 side, which will be described later, in phase with each other around the axis X1.
  • the positioning pin 44p inserted into the insertion hole 782 penetrates the through hole 444 of the pinion shaft 44.
  • the pinion shaft 44 is supported on the second case portion 7 side in a state where rotation around the axis X1 is restricted.
  • the region protruding from the stepped pinion gear 43 is the first shaft portion 445.
  • the first shaft portion 445 is supported by a support hole 61a provided in the first case portion 6 of the differential case 50.
  • the region protruding from the stepped pinion gear 43 is the second shaft portion 446.
  • the second shaft portion 446 is supported by a support hole 71a provided in the second case portion 7 of the differential case 50.
  • first shaft portion 445 means a region on the one end 44a side of the pinion shaft 44 where the stepped pinion gear 43 is not extrapolated.
  • the second shaft portion 446 means a region on the other end 44b side of the pinion shaft 44 where the stepped pinion gear 43 is not extrapolated.
  • the length of the second shaft portion 446 of the pinion shaft 44 in the axis X1 direction is longer than the length of the first shaft portion 445 in the axis X1 direction.
  • FIG. 5 is an exploded perspective view of the differential mechanism 5 around the differential case 50.
  • the differential case 50 of the differential mechanism 5 is formed by assembling the first case portion 6 and the second case portion 7 in the rotation axis X direction.
  • the first case portion 6 and the second case portion 7 of the differential case 50 have a function as a carrier for supporting the pinion shaft 44 of the planetary reduction gear 4.
  • three pinion mate gears 52 and three pinion mate shafts 51 are provided between the first case portion 6 and the second case portion 7 of the differential case 50.
  • the pinion mate shaft 51 functions as a support shaft for supporting the pinion mate gear 52.
  • the pinion mate shafts 51 are provided at equal intervals in the circumferential direction around the rotation axis X.
  • the inner diameter side ends of each of the pinion mate shafts 51 are connected to a common connecting portion 510.
  • One pinion mate gear 52 is extrapolated to each of the pinion mate shaft 51.
  • Each of the pinion mate gears 52 is in contact with the connecting portion 510 from the radial outside of the rotating shaft X. In this state, each of the pinion mate gears 52 is rotatably supported by the pinion mate shaft 51.
  • a spherical washer 53 is extrapolated to the pinion mate shaft 51.
  • the spherical washer 53 is in contact with the spherical outer circumference of the pinion mate gear 52.
  • the side gear 54A is located on one side of the connecting portion 510 in the rotation axis X direction, and the side gear 54B is located on the other side.
  • the side gear 54A is rotatably supported by the first case portion 6.
  • the side gear 54B is rotatably supported by the second case portion 7.
  • the side gear 54A meshes with the three pinion mate gears 52 from one side in the rotation axis X direction.
  • the side gear 54B meshes with the three pinion mate gears 52 from the other side in the rotation axis X direction.
  • the first case portion 6 has a ring-shaped base portion 61.
  • the base portion 61 is a plate-shaped member having a thickness W61 in the rotation axis X direction.
  • An opening 60 is provided in the central portion of the base portion 61.
  • a tubular wall portion 611 surrounding the opening 60 is provided on the surface of the base portion 61 opposite to the second case portion 7 (on the right side in the drawing). The outer periphery of the cylinder wall portion 611 is supported by the plate member PT via the bearing B3.
  • three connecting beams 62 extending toward the second case portion 7 are provided on the surface of the base portion 61 on the second case portion 7 side.
  • the connecting beams 62 are provided at equal intervals in the circumferential direction around the rotation axis X.
  • the connecting beam 62 has a base portion 63 orthogonal to the base portion 61 and a connecting portion 64 wider than the base portion 63.
  • a support groove 65 for supporting the pinion mate shaft 51 is provided on the tip surface of the connecting portion 64.
  • An arc portion 641 is formed on the inner diameter side (rotation shaft X side) of the connecting portion 64 in a shape along the outer circumference of the pinion mate gear 52.
  • the outer circumference of the pinion mate gear 52 is supported via the spherical washer 53.
  • the gear support portion 66 is connected to the boundary portion between the base portion 63 and the connecting portion 64.
  • the gear support portion 66 is provided in a direction orthogonal to the rotation axis X.
  • the gear support portion 66 has a through hole 660 in the central portion.
  • the gear support portion 66 is provided with a recess 661 surrounding the through hole 660 on the surface opposite to the base portion 61 (on the left side in the drawing).
  • a ring-shaped washer 55 that supports the back surface of the side gear 54A is housed in the recess 661.
  • a cylindrical wall portion 541 is provided on the back surface of the side gear 54A. The washer 55 is extrapolated to the cylinder wall portion 541.
  • the support hole 61a of the pinion shaft 44 is opened in the base portion 61.
  • the support hole 61a opens in the region between the connecting beams 62, 62 arranged at intervals in the circumferential direction around the rotation axis X.
  • the base portion 61 is provided with a boss portion 616 that surrounds the support hole 61a. The washer Wc extrapolated to the pinion shaft 44 comes into contact with the boss portion 616 from the rotation axis X direction.
  • bolt holes 67 and 67 are provided on both sides of the support groove 65.
  • a connecting portion 74 on the side of the second case portion 7 is joined to the connecting portion 64 of the first case portion 6 from the rotation axis X direction.
  • the bolt B penetrating the connecting portion on the second case portion 7 side is screwed into the bolt holes 67 and 67 and joined to each other.
  • the second case portion 7 has a ring-shaped base portion 71.
  • the base 71 is a plate-shaped member having a thickness W71 in the rotation axis X direction.
  • a through hole 70 that penetrates the base 71 in the thickness direction is provided in the central portion of the base 71.
  • a protrusion 73a protruding toward the rotation axis X side is provided.
  • the protrusion 73a is provided over the entire circumference in the circumferential direction around the rotation axis X.
  • Three support holes 71a of the pinion shaft 44 are opened on the outer diameter side of the peripheral wall portion 73.
  • the support holes 71a are provided at intervals in the circumferential direction around the rotation axis X.
  • On the inner diameter side of the peripheral wall portion 73 three slits 710 that penetrate the base portion 71 in the thickness direction are provided.
  • the slit 710 is formed in an arc shape along the inner circumference of the peripheral wall portion 73 when viewed from the rotation axis X direction.
  • the slit 710 is formed in a predetermined angle range in the circumferential direction around the rotation axis X.
  • the slits 710 are provided at intervals in the circumferential direction around the rotation axis X.
  • Each of the slits 710 is provided across the inner diameter side of the support hole 71a in the circumferential direction around the rotation axis X.
  • a protruding wall 711 protruding toward the front side of the paper surface is provided between the slits 710 and 710 adjacent to each other in the circumferential direction around the rotation axis X.
  • the protruding wall 711 extends linearly in the radial direction of the rotation axis X.
  • the protruding wall 711 is provided so as to straddle the peripheral wall portion 73 on the outer diameter side and the tubular wall portion 72 on the inner diameter side.
  • the three protruding walls 711 are provided at intervals in the circumferential direction around the rotation axis X.
  • the protruding wall 711 is provided with a phase shifted by approximately 45 degrees in the circumferential direction around the rotation axis X with respect to the slit 710.
  • bolt accommodating portions 76, 76 recessed on the inner side of the paper surface are provided between the support holes 71a, 71a adjacent to each other in the circumferential direction around the rotation axis X.
  • a bolt insertion hole 77 is opened inside the bolt accommodating portion 76. The insertion hole 77 penetrates the base 71 in the thickness direction (rotation axis X direction).
  • a connecting portion 74 projecting to the first case portion 6 side is provided on the surface of the base portion 71 on the first case portion 6 side (right side in the drawing).
  • the number of connecting portions 74 is provided in the same number as the number of connecting beams 62 on the side of the first case portion 6.
  • a support groove 75 for supporting the pinion mate shaft 51 is provided on the tip surface of the connecting portion 74.
  • An arc portion 741 along the outer circumference of the pinion mate gear 52 is provided on the inner diameter side (rotation shaft X side) of the connecting portion 74.
  • the outer circumference of the pinion mate gear 52 is supported via the spherical washer 53.
  • a ring-shaped washer 55 that supports the back surface of the side gear 54B is placed on the surface of the base portion 71 on the side of the first case portion 6.
  • a cylindrical wall portion 540 is provided on the back surface of the side gear 54B. The washer 55 is extrapolated to the cylinder wall portion 540.
  • a guide portion 78 is provided at the base 71 of the second case portion 7.
  • the guide portion 78 projects toward the first case portion 6 (right side in the figure).
  • the number of guide portions 78 is the same as that of the boss portions 616 of the first case portion 6.
  • the pinion shaft 44 is inserted into the support hole 71a of the guide portion 78 from the side of the first case portion 6.
  • the pinion shaft 44 is positioned in a state where rotation around the axis X1 is restricted by the positioning pin 44p.
  • the small-diameter gear portion 432 of the stepped pinion gear 43 extrapolated to the pinion shaft 44 is in contact with the guide portion 78 from the axis X1 direction with the washer Wc sandwiched between them.
  • the bearing B2 is extrapolated to the cylinder wall portion 72 of the second case portion 7.
  • the bearing B2 extrapolated to the cylinder wall portion 72 is held by the support portion 145 of the fourth box 14.
  • the cylinder wall portion 72 of the differential case 50 is rotatably supported by the fourth box 14 via the bearing B2.
  • a drive shaft DB penetrating the opening 145a of the fourth box 14 is inserted into the support portion 145 from the rotation axis X direction.
  • the drive shaft DB is rotatably supported by the support portion 145.
  • a lip seal RS is fixed to the inner circumference of the opening 145a.
  • the lip portion (not shown) of the lip seal RS is elastically in contact with the outer periphery of the cylinder wall portion 540 of the side gear 54B extrapolated to the drive shaft DB. As a result, the gap between the outer circumference of the cylinder wall portion 540 of the side gear 54B and the inner circumference of the opening 145a is sealed.
  • the first case portion 6 of the differential case 50 is supported by the plate member PT via a bearing B3 extrapolated to the cylinder wall portion 611.
  • a drive shaft DA penetrating the insertion hole 130a of the third box 13 is inserted into the inside of the first case portion 6 from the rotation axis X direction.
  • the drive shaft DA is provided across the motor shaft 20 of the motor 2 and the inner diameter side of the sun gear 41 of the planetary reduction gear 4 in the rotation axis X direction.
  • the side gears 54A and 54B are spline-fitted on the outer periphery of the tips of the drive shafts DA and DB.
  • the side gears 54A and 54B and the drive shafts DA and DB are integrally rotatably connected around the rotation axis X.
  • the side gears 54A and 54B are arranged to face each other with a gap in the rotation axis X direction.
  • a connecting portion 510 of the pinion mate shaft 51 is located between the side gears 54A and 54B.
  • a total of three pinion mate shafts 51 extend radially outward from the connecting portion 510.
  • a pinion mate gear 52 is supported on each of the pinion mate shafts 51. The pinion mate gear 52 is assembled to the side gear 54A located on one side in the rotation axis X direction and the side gear 54B located on the other side in a state where the teeth are meshed with each other.
  • the oil OL for lubrication is stored inside the fourth box 14.
  • the lower side of the differential case 50 is located in the stored oil OL.
  • the oil OL is stored up to the height at which the connecting beam 62 is located in the oil OL.
  • the stored oil OL is scraped up by the differential case 50 that rotates around the rotation axis X when the output rotation of the motor 2 is transmitted.
  • FIG. 6 to 11 are views for explaining the oil catch portion 15.
  • FIG. 6 is a plan view of the fourth box 14 as viewed from the third box 13 side.
  • FIG. 7 is a perspective view of the oil catch portion 15 shown in FIG. 6 as viewed from diagonally above.
  • FIG. 8 is a plan view of the fourth box 14 as viewed from the third box 13 side.
  • FIG. 8 shows a state in which the differential case 50 is arranged.
  • FIG. 9 is a perspective view of the oil catch portion 15 shown in FIG. 8 as viewed from diagonally above.
  • FIG. 10 is a schematic view of a cross section taken along the line AA in FIG. FIG.
  • FIG. 11 is a schematic diagram illustrating the positional relationship between the oil catch portion 15 and the differential case 50 (first case portion 6, second case portion 7) when the power transmission device 1 is viewed from above.
  • hatching is added to clarify the positions of the joint portion 142 of the fourth box 14 and the support wall portion 146.
  • the fourth box 14 when viewed from the rotation axis X direction is provided with a support wall portion 146 that surrounds the central opening 145a at intervals.
  • the inside of the support wall portion 146 (rotation axis X) is the accommodating portion 140 of the differential case 50.
  • a space for the oil catch portion 15 and a space for the breather chamber 16 are formed in the upper part of the fourth box 14.
  • a communication port 147 for communicating the oil catch portion 15 and the accommodating portion 140 of the differential case 50 is provided in the region intersecting the vertical line VL.
  • the oil catch portion 15 and the breather chamber 16 are located on one side (left side in the figure) and the other side (right side in the figure) of the vertical line VL orthogonal to the rotation axis X, respectively.
  • the oil catch portion 15 is arranged at a position offset from the vertical line VL passing through the rotation center (rotation axis X) of the differential case 50. Looking at the oil catch portion 15 from above, the oil catch portion 15 is arranged at a position offset from directly above the differential case 50.
  • the vertical line VL is a vertical line VL based on the installation state of the power transmission device 1 in the electric vehicle EV.
  • the vertical line VL seen from the rotation axis X direction is orthogonal to the rotation axis X.
  • the horizontal line HL is a horizontal line HL based on the installation state of the power transmission device 1 in the electric vehicle EV.
  • the horizontal line HL when viewed from the rotation axis X direction is orthogonal to the rotation axis X.
  • the oil catch portion 15 is formed so as to extend to the back side of the paper surface from the support wall portion 146.
  • a support base portion 151 (shelf portion) is provided on the lower edge of the oil catch portion 15 so as to project toward the front side of the paper surface.
  • the support base portion 151 is provided on the front side of the paper surface with respect to the support wall portion 146, and is provided in a range from the joint portion 142 of the fourth box 14 to the back side of the paper surface.
  • a communication port 147 is provided on the vertical VL side (right side in the figure) of the oil catch portion 15 when viewed from the rotation axis X direction.
  • the communication port 147 communicates the oil catch portion 15 with the accommodating portion 140 of the differential case 50.
  • the communication port 147 is formed by cutting out a part of the support wall portion 146.
  • the communication port 147 when viewed from the rotation axis X direction is provided in a range that crosses the vertical line VL from the breather chamber 16 side (right side in the figure) to the oil catch portion 15 side (left side in the figure).
  • the differential case 50 when the electric vehicle EV equipped with the power transmission device 1 is traveling forward, the differential case 50 is in the counterclockwise direction CCW around the rotation axis X when viewed from the third box 13 side. Rotate. Therefore, the oil catch portion 15 is located on the downstream side in the rotation direction of the differential case 50.
  • the width of the communication port 147 in the circumferential direction is wider on the left side of the vertical line VL than on the right side.
  • the left side of the vertical line VL is the downstream side in the rotation direction of the differential case 50, and the right side is the upstream side.
  • the outer peripheral position of the rotary orbit of the second shaft portion 446 of the pinion shaft 44 and the outer peripheral position of the rotary orbit of the large diameter gear portion 431 are offset in the radial direction of the rotary shaft X. ing.
  • the outer peripheral position of the rotary track of the second shaft portion 446 is located on the inner diameter side of the outer peripheral position of the rotary track of the large diameter gear portion 431. Therefore, the second shaft portion 446 has a spatial margin on the outer diameter side.
  • the oil catch portion 15 is provided by utilizing this space, and the space inside the main body box 10 can be effectively used.
  • the second shaft portion 446 projects to the back side of the small diameter gear portion 432 when viewed from the motor 2.
  • a peripheral member of the second shaft portion 446 (for example, the guide portion 78 of the differential case 50 that supports the second shaft portion 446) is located close to the oil catch portion 15.
  • the oil OL lubricating oil
  • an end portion on the outer diameter side of the oil hole 151a is opened on the inner side of the support base portion 151.
  • the oil hole 151a extends in the fourth box 14 toward the inner diameter side.
  • the end portion of the oil hole 151a on the inner diameter side is open to the inner circumference of the support portion 145.
  • the end portion of the support portion 145 on the inner diameter side of the oil hole 151a is open between the lip seal RS and the bearing B2.
  • an oil guide 152 is mounted on the support base portion 151.
  • the oil guide 152 has a catch portion 153 and a guide portion 154 extending from the catch portion 153 to the first box 11 side (front side of the paper surface in FIG. 9).
  • the support base portion 151 is located at a position overlapping a part of the differential case 50 (first case portion 6, second case portion 7) on the radial outside of the rotation axis X when viewed from above. It is provided so as to avoid interference with the attached pinion gear 43 (large diameter gear portion 431).
  • the catch portion 153 is provided at a position overlapping the second shaft portion 446 of the pinion shaft 44 when viewed from the radial direction of the rotation shaft X.
  • the guide portion 154 is provided at a position where the first shaft portion 445 of the pinion shaft 44 and the large diameter gear portion 431 overlap each other.
  • a notch portion 155 is provided in the wall portion 153a.
  • the cutout portion 155 is provided in a region facing the oil hole 151a. A part of the oil OL stored in the catch portion 153 is discharged from the notch portion 155 toward the oil hole 151a.
  • the guide portion 154 extends toward the second box 12 side (lower side in FIG. 11) at a position avoiding interference with the differential case 50.
  • Wall portions 154a and 154a are provided on both sides of the guide portion 154 in the width direction.
  • the wall portions 154a and 154a are provided over the entire length of the guide portion 154 in the longitudinal direction.
  • the wall portions 154a and 154a are connected to the wall portion 153a surrounding the outer periphery of the catch portion 153. A part of the oil OL stored in the catch portion 153 also flows to the guide portion 154 side.
  • the guide portion 154 is inclined downward as it is separated from the catch portion 153.
  • the tip 154b of the guide portion 154 is provided with a gap between it and the wall portion 120 of the second box 12.
  • one end 126a1 of the oil passage 126a is opened at a position on the extension of the guide portion 154.
  • the oil passage 126a is provided in the rib 126 provided on the outer peripheral 121c of the peripheral wall portion 121.
  • the tip 154b of the guide portion 154 and one end 126a1 of the oil passage 126a face each other with a gap in the rotation axis X direction (left-right direction in FIG. 10).
  • FIG. 12 is a diagram illustrating a flow of oil OL around the motor 2.
  • FIG. 12 shows a cross section different from that of FIG.
  • FIG. 13 is a diagram illustrating the cover member 9B.
  • FIG. 13 is an enlarged view of the A region of FIG.
  • FIG. 14 is a diagram illustrating a flow of oil OL around the coil end 253b.
  • FIG. 14 is a schematic view of a CC cross section in FIG.
  • FIG. 15 is a diagram illustrating the partition wall 95 of the cover member 9B.
  • FIG. 15 is a schematic view of a cross section taken along the line AA of FIG. In FIG. 14, the size of the cover member 9B is exaggerated. Further, in FIG.
  • the region where the coil end 253b is arranged in the accommodation chamber K is shown by a virtual line with cross hatching. Further, in FIG. 14, the drive shaft DA is shown by a broken line. In FIG. 15, in order to make it easy to see the position of the partition wall 95, cross-hatching is attached to the portion of the partition wall 95.
  • an oil passage 126a into which the oil OL flows is formed in the rib 126 of the second box 12 (see FIG. 10).
  • the rib 126 bulges outward from the outer peripheral 121c of the peripheral wall portion 121 of the second box 12 and surrounds the oil passage 126a.
  • the rib 126 is formed from the joint portion 123 on the other end side of the second box 12 to the joint portion 122 on the one end side.
  • the oil passage 126a inside the rib 126 has one end 126a1 in the longitudinal direction open to the end surface of the joint portion 123.
  • the oil passage 126a extends to the vicinity of the joint portion 122.
  • An oil hole 170b extending toward the inner diameter is connected to the other end 126a2 of the oil passage 126a.
  • the oil hole 170b is opened at a position facing the oil hole 170a of the support wall portion 111 described above.
  • the oil hole 170b on the peripheral wall portion 121 side and the oil hole 170a on the support wall portion 111 side form an oil passage 170 that communicates the oil passage 126a and the motor chamber Sa.
  • An oil hole 171b extending to the inner diameter side is connected to one end 126a1 side of the oil passage 126a.
  • the oil hole 171b is opened at a position facing the oil hole 171a of the support wall portion 111 described above.
  • the oil hole 171b on the peripheral wall portion 121 side and the oil hole 171a on the support wall portion 111 side form an oil passage 171 that communicates the oil passage 126a and the motor chamber Sa.
  • a part of the oil OL scraped up by the rotation of the differential case 50 reaches the oil catch portion 15.
  • a part of the oil OL in the oil catch portion 15 is discharged from the guide portion 154 to the oil passage 126a, and then is supplied to the motor chamber Sa through the oil passages 170 and 171.
  • the coil end 253a described above and the cover member 9A surrounding the coil end 253a are located on the lower side of the oil passage 170 in the vertical direction VL direction.
  • the coil end 253b described above and the cover member 9B wrapping the coil end 253b are located on the lower side of the oil passage 171 in the vertical direction VL direction.
  • the coil ends 253a and 253b according to the present embodiment and the cover members 9A and 9B surrounding the coil ends 253a and 253b have symmetrical shapes with the tooth portion 252 of the motor 2 interposed therebetween.
  • the cover member 9B has a ring shape surrounding the rotation axis X.
  • the cover member 9B is provided so as to surround the region where the coil end 253b is provided.
  • the coil end 253b includes an outer peripheral surface 253b1 and an inner peripheral surface 253b2 provided in a direction along the rotation axis X, and an end surface 253b3 provided in a direction along the radial direction of the rotation axis X.
  • the outer peripheral surface 253b1 of the coil end 253b has a width W1 in the rotation axis X direction (left-right direction in the figure) shorter than the width W2 of the inner peripheral surface 253b2 (W1 ⁇ W2). Therefore, a gap Ca in the rotation axis X direction is formed between the coil end 253b and the tooth portion 252 on the outer diameter side (outer peripheral surface 253b1).
  • the cover member 9B has an outer peripheral wall 90, an inner peripheral wall 91, and a connecting wall 92.
  • the outer peripheral wall 90 has a cylindrical shape that surrounds the outer peripheral surface 253b1 of the coil end 253b at intervals.
  • the inner peripheral wall 91 has a tubular shape inserted into the inner peripheral surface 253b2 of the coil end 253b.
  • the connection wall 92 faces the end surface 253b3 of the coil end 253b at a distance in the rotation axis X direction.
  • connection wall 92 overlaps with the coil end 253b and the wall portion 120 in the X direction of the rotation axis. Further, the connection wall 92 is arranged substantially parallel to the end surface 253b3 of the coil end 253b, and connects the outer peripheral wall 90 and the end portions of the inner peripheral wall 91 to each other.
  • the outer peripheral wall 90 overlaps with the coil end 253b and the support wall portion 111 in the radial direction of the rotation axis X.
  • a locking portion 90a extending toward the inner diameter is provided at the tip of the outer peripheral wall 90.
  • the locking portion 90a is formed by bending the tip end side of the outer peripheral wall 90 toward the inner diameter side. The locking portion 90a is inserted into the gap Ca between the coil end 253b and the teeth portion 252.
  • the inner peripheral wall 91 overlaps with the coil end 253b and the motor support portion 125 in the radial direction of the rotation axis X.
  • the inner peripheral wall 91 is provided so as to cross between the outer periphery of the rotor core 21 and the coil end 253b of the stator core 25 in the radial direction of the rotation axis X of the motor 2. That is, the inner peripheral wall 91 constitutes a wall portion that separates the rotor core 21 and the stator core 25.
  • the cover member 9B has the tip 91a of the inner peripheral wall 91 in contact with the teeth portion 252 from the rotation axis X direction, and the locking portion 90a is locked to the side surface of the coil end 253b on the teeth portion 252 side. It is attached to the coil end 253b.
  • the cover member 9B When the cover member 9B is attached to the coil end 253b, the coil end 253b is housed in the space K surrounded by the outer peripheral wall 90, the inner peripheral wall 91, and the connecting wall 92 of the cover member 9B. That is, the cover member 9B locally wraps the portion of the coil 253 at the coil end 253b. In this state, a gap through which oil OL can flow is formed between the cover member 9B and the side and the upper side of the coil end 253b.
  • the space K is also referred to as a storage room K.
  • the accommodation chamber K formed inside the cover member 9B forms a substantially annular shape that surrounds the rotation axis X at intervals.
  • the region where the coil end 253b is arranged in the accommodation chamber K is shown by a virtual line with cross hatching.
  • the accommodation chamber K is formed so as to be isolated from the motor chamber Sa inside the first box 11.
  • the volume of the accommodation chamber K is smaller than the volume of the motor chamber Sa.
  • a gap CL1 is formed between the outer peripheral wall 90 of the cover member 9B in the radial direction of the rotation axis X and the support wall portion 111 of the first box 11. Further, a gap CL2 is formed between the inner peripheral wall 91 of the cover member 9B in the radial direction of the rotation shaft X and the motor support portion 125 of the second box 12. A gap CL3 in the rotation axis X direction is formed between the connection wall 92 of the cover member 9B and the wall portion 120 of the second box 12. As shown in FIGS. 12 and 14, the drive shaft DA is arranged so as to pass outside the accommodation chamber K of the cover member 9B and to pass through a position on the inner peripheral side of the accommodation chamber K.
  • the outer peripheral wall 90 of the cover member 9B is formed with a through hole 901 penetrating the outer peripheral wall 90 and a tubular wall portion 902 surrounding the through hole 901.
  • the through hole 901 is provided in a positional relationship overlapping with the coil end 253b.
  • the tubular wall portion 902 surrounding the through hole 901 projects upward in the vertical line VL direction.
  • the through hole 901 and the cylinder wall portion 902 are formed above the horizontal line HL passing through the rotation axis X.
  • the through hole 901 is provided at a position facing the oil hole 171a at a distance in the vertical VL direction when the cover member 9B is attached to the coil end 253b. ..
  • the cylinder wall portion 902 surrounding the through hole 901 is formed with an outer diameter larger than the inner diameter of the oil hole 171a. Therefore, the cylinder wall portion 902 is provided with a gap in the vertical line VL direction between the cylinder wall portion 902 and the support wall portion 111 in which the oil hole 171a opens.
  • the cylinder wall portion 902 may be formed with an outer diameter smaller than the inner diameter of the oil hole 171a. In this case, the cylinder wall portion 902 may be arranged in a state of being inserted into the oil hole 171a.
  • the outer peripheral wall 90 of the cover member 9B is provided with a through hole 901 at the highest position in the vertical line VL direction when viewed from the rotation axis X direction.
  • the vertical straight line VL is a straight line orthogonal to the axis of rotation X, and the through hole 901 penetrates the outer peripheral wall 90 in the vertical straight line VL direction at a position concentric with the vertical straight line VL.
  • a through hole 903 that penetrates the outer peripheral wall 90 in the vertical line VL direction is formed at a position adjacent to the through hole 901 when viewed from the rotation axis X direction.
  • the through hole 903 When viewed from the rotation axis X direction, the through hole 903 is offset in the circumferential direction around the rotation axis X with respect to the through hole 901.
  • the through hole 903, together with the through hole 901, is located above the horizontal line HL passing through the rotation axis X.
  • "adjacent" means a state in which the through hole 903 is arranged near the through hole 901.
  • the through holes 901 and 903 communicate the inner accommodation chamber K of the cover member 9B and the outer motor chamber Sa, respectively.
  • the above-mentioned oil passage 171 is opened above the through hole 901. Therefore, the oil OL discharged from the oil passage 171 flows into the storage chamber K inside the cover member 9B from the through hole 901.
  • a partition wall 95 is provided between the through holes 901 and 903 adjacent to each other in the circumferential direction around the rotation axis X.
  • the partition wall 95 constitutes a partition portion that partitions the internal space of the accommodation chamber K.
  • the partition wall 95 is also located above the horizontal line HL passing through the rotation axis X.
  • the storage chamber K forms an oil OL flow path that substantially goes around the rotation axis X in the circumferential direction from one end where the through hole 901 opens to the other end where the through hole 903 opens by the partition wall 95.
  • the through hole 901 is an oil OL introduction port into the formed flow path
  • the through hole 903 is an oil OL discharge port.
  • the partition wall 95 has a state in which the coil end 253b is wrapped with the cover member 9B, and the outer peripheral wall 90, the inner peripheral wall 91 and the connecting wall 92 of the cover member 9B, and the surface of the coil end 253b. It is provided to close the gap.
  • the partition wall 95 may be formed in advance in a shape that follows the outer shape of the coil end 253b before being wrapped with the cover member 9B. Further, the partition wall 95 is pre-filled with a liquid sealing material in the storage chamber K before being wrapped with the cover member 9B, and the sealing material is formed on the outer shape of the coil end 253b in the process of wrapping the coil end 253b with the cover member 9B. It may be deformed to imitate.
  • the sealing material may have the property of hardening after a lapse of a predetermined time.
  • FIG. 16 is a diagram illustrating the cover member 9A.
  • FIG. 16 is an enlarged view of the B region of FIG.
  • FIG. 17 is a diagram illustrating a flow of oil OL around the coil end 253a.
  • FIG. 17 is a schematic view of a cross section taken along the line AA in FIG.
  • the cover member 9A has the same configuration as the cover member 9B described above.
  • the cover member 9A has an outer peripheral wall 90, an inner peripheral wall 91, and a connecting wall 92.
  • the outer peripheral wall 90 has a cylindrical shape that surrounds the outer peripheral surface 253a1 of the coil end 253a at intervals.
  • the inner peripheral wall 91 has a tubular shape inserted into the inner peripheral surface 253a2 of the coil end 253a.
  • the connection wall 92 faces the end surface 253a3 of the coil end 253a at a distance in the rotation axis X direction.
  • connection wall 92 overlaps with the coil end 253a and the wall portion 130 in the rotation axis X direction. Further, the connection wall 92 is arranged substantially parallel to the end surface 253a3 of the coil end 253a, and connects the outer peripheral wall 90 and the end portions of the inner peripheral wall 91 to each other.
  • the outer peripheral wall 90 overlaps with the coil end 253a and the support wall portion 111 in the radial direction of the rotation axis X.
  • a locking portion 90a extending toward the inner diameter is provided at the tip of the outer peripheral wall 90.
  • the locking portion 90a is formed by bending the tip end side of the outer peripheral wall 90 toward the inner diameter side. The locking portion 90a is inserted into the gap Ca between the coil end 253a and the teeth portion 252.
  • the inner peripheral wall 91 overlaps with the coil end 253a and the motor support portion 135 in the radial direction of the rotation axis X.
  • the inner peripheral wall 91 is provided so as to cross between the outer periphery of the rotor core 21 and the coil end 253a of the stator core 25 in the radial direction of the rotation axis X of the motor 2. That is, the inner peripheral wall 91 constitutes a wall portion that separates the rotor core 21 and the stator core 25.
  • the cover member 9A also has the tip 91a of the inner peripheral wall 91 in contact with the teeth portion 252 from the rotation axis X direction, and the locking portion 90a is locked to the side surface of the coil end 253a on the teeth portion 252 side. , Attached to the coil end 253a.
  • the cover member 9A When the cover member 9A is attached to the coil end 253a, the coil end 253a is accommodated in the space K (accommodation chamber K) surrounded by the outer peripheral wall 90, the inner peripheral wall 91, and the connecting wall 92 of the cover member 9A. That is, the cover member 9A locally wraps the portion of the coil 253 at the coil end 253a. In this state, a gap through which oil OL can flow is formed between the coil end 253a and the cover member 9A on the side and above.
  • the volume of the accommodation chamber K is smaller than the volume of the motor chamber Sa.
  • the drive shaft DA is arranged so as to pass outside the accommodation chamber K of the cover member 9A and to pass through a position on the inner peripheral side of the accommodation chamber K.
  • the outer peripheral wall 90 of the cover member 9A is formed with a through hole 901 penetrating the outer peripheral wall 90 and a tubular wall portion 902 surrounding the through hole 901.
  • the through hole 901 is provided in a positional relationship overlapping with the coil end 253a.
  • the through hole 901 is provided at a position facing the oil passage 170 (oil hole 170a) in the vertical VL direction (vertical direction in the figure) when the cover member 9A is attached to the coil end 253a.
  • a through hole 903 that penetrates the outer peripheral wall 90 in the vertical line VL direction is formed at a position adjacent to the through hole 901 when viewed from the rotation axis X direction.
  • the through hole 903 is offset in the circumferential direction around the rotation axis X with respect to the through hole 901.
  • the through hole 903, together with the through hole 901, is located above the horizontal line HL passing through the rotation axis X.
  • a partition wall 95 is provided between the through holes 901 and 903 adjacent to each other in the circumferential direction around the rotation axis X.
  • the partition wall 95 constitutes a partition portion that partitions the internal space of the accommodation chamber K.
  • the partition wall 95 is also located above the horizontal line HL passing through the rotation axis X.
  • the partition wall 95 forms an oil OL flow path that makes a substantially circular rotation around the rotation axis X from one end where the through hole 901 opens to the other end where the through hole 903 opens.
  • the gear mechanism 3 (planetary reduction gear 4, differential mechanism 5), the drive shaft DA, and the DB (drive shaft) are along the transmission path of the output rotation of the motor 2. And are provided.
  • the sun gear 41 is an input unit for the output rotation of the motor 2.
  • the differential case 50 that supports the stepped pinion gear 43 is the output unit of the input rotation.
  • the stepped pinion gear 43 (large diameter gear portion 431, small diameter gear portion 432) rotates around the axis X1 by the rotation input from the sun gear 41 side. do.
  • the small-diameter gear portion 432 of the stepped pinion gear 43 meshes with the ring gear 42 fixed to the inner circumference of the fourth box 14. Therefore, the stepped pinion gear 43 revolves around the rotation axis X while rotating around the axis X1.
  • the outer diameter R2 of the small diameter gear portion 432 of the stepped pinion gear 43 is smaller than the outer diameter R1 of the large diameter gear portion 431 (see FIG. 3).
  • the differential case 50 first case portion 6, second case portion 7) that supports the stepped pinion gear 43 rotates around the rotation axis X at a rotation speed lower than the rotation input from the motor 2 side. Therefore, the rotation input to the sun gear 41 of the planetary reduction gear 4 is greatly decelerated by the stepped pinion gear 43. The decelerated rotation is output to the differential case 50 (differential mechanism 5).
  • the differential case 50 rotates around the rotation axis X by the input rotation, so that the drive shafts DA and DB that mesh with the pinion mate gear 52 rotate around the rotation axis X in the differential case 50.
  • the left and right drive wheels W and W (see FIG. 1) of the electric vehicle EV on which the power transmission device 1 is mounted are rotated by the transmitted rotational driving force.
  • the oil OL for lubrication is stored inside the fourth box 14 (gear chamber Sb). Therefore, the stored oil OL is scraped up by the differential case 50 (stepped pinion gear 43) that rotates around the rotation axis X when the output rotation of the motor 2 is transmitted.
  • the entire gear mechanism 3 is lubricated by the oil OL that has been scraped up.
  • the meshed portion between the sun gear 41 and the large-diameter gear portion 431, the meshing portion between the small-diameter gear portion 432 and the ring gear 42, the pinion mate gear 52, and the side gears 54A and 54B are provided by the oil OL that has been scraped up.
  • the meshing part with is lubricated.
  • the differential case 50 rotates in the counterclockwise direction CCW about the rotation axis X when viewed from the third box 13 side.
  • An oil catch portion 15 is provided on the upper portion of the fourth box 14. The oil catch portion 15 is located on the downstream side in the rotation direction of the differential case 50. Most of the oil OL scraped up by the differential case 50 flows into the oil catch portion 15.
  • a part of the oil OL that has flowed into the oil catch portion 15 flows from the catch portion 153 to the guide portion 154 side and then flows into the oil passage 126a.
  • the oil OL that has flowed into the oil passage 126a is discharged from the oil passages 170 and 171.
  • the partition wall 95 extends from the region where the through hole 901 is provided to the region where the through hole 903 is provided in the circumferential direction around the rotation axis X.
  • a flow path of the oil OL that goes around substantially is formed.
  • the accommodation chamber K in the cover member 9A is also provided by the partition wall 95 in the circumferential direction around the rotation axis X from the region where the through hole 901 is provided to the region where the through hole 903 is provided.
  • a flow path of the oil OL that goes around substantially is formed.
  • the tubular wall portion 902 surrounding the through hole 901 projects upward in the vertical line VL direction.
  • the lower end of the through hole 903 in the vertical line VL direction is located below the upper end of the tubular wall portion 902 by a height h. Therefore, the oil OL that has flowed into the storage chamber K can be stored in the storage chamber K up to the height of the lower end of the through hole 903.
  • the tubular wall portion 902 surrounding the through hole 901 projects upward in the vertical line VL direction.
  • the lower end of the through hole 903 in the vertical line VL direction is located below the upper end of the tubular wall portion 902 by a height h. Therefore, the oil OL that has flowed into the storage chamber K can be stored in the storage chamber K up to the height of the lower end of the through hole 903.
  • oil OL continuously flows into the storage chamber K from the through hole 901.
  • the oil OL that has flowed into the storage chamber K flows through the storage chamber K in one direction (arrow directions in FIGS. 14 and 17) in the circumferential direction around the rotation axis X, and then passes through the through hole 903 to the outside of the storage chamber K. It is discharged into the motor chamber Sa.
  • the coil ends 253b and 253a are submerged in the oil OL in the accommodation chamber K over almost the entire circumference in the circumferential direction. In the process of moving the oil OL toward the through hole 903, the coil ends 253b and 253a are cooled.
  • the material of the windings constituting the coil 253 is copper, which has high thermal conductivity. Therefore, when the coil ends 253a and 253b are cooled, the entire coil 253 is cooled by heat conduction, and finally the entire stator core 25 including the yoke portion 251 and the teeth portion 252 is cooled.
  • the motor chamber Sa communicates with the oil reservoir 128 via the oil passages 180 and 181 described above in the lower region in the vertical VL direction.
  • the oil OL that has flowed into the oil reservoir 128 side flows into the gear chamber Sb and is scraped up again by the rotating differential case 50. Then, a part of the scraped oil OL is supplied into the motor chamber Sa via the oil passage 126a and used for cooling the motor 2. Therefore, when the electric vehicle EV equipped with the power transmission device 1 is running, at least the coil ends 253a and 253b are continuously cooled by the oil OL supplied through the oil passages 180 and 181.
  • the present invention is not limited to this embodiment.
  • the following may be performed.
  • the entire coil 253 is wrapped with a cover member.
  • Only one of the coil ends 253a and 253b is wrapped with the cover member.
  • the case where the cover members 9A and 9B have a shape of wrapping the surface of the coil ends 253a and 253b over the entire surface is exemplified.
  • the shapes of the cover members 9A and 9B are not limited to these shapes.
  • the cover members 9A and 9B may have a shape that encloses a part of the coil ends 253a and 253b. For example, even if the cover member has the same cross-sectional shape as the cover members 9A and 9B in the direction along the rotation axis X (see FIG. 2), and the shape seen from the rotation axis X direction forms an arc shape surrounding the rotation axis X. good.
  • the partition wall 95 in the cover members 9A and 9B is eliminated, and the region above the height of the oil OL stored in the motor chamber Sa in the vertical direction with respect to the installation state of the power transmission device 1 is eliminated. It is preferable to provide a cover member in a range covering the above. Even with this configuration, the same effects as in the case of the cover members 9A and 9B described above can be exhibited.
  • cover members 9A and 9B may have a shape in which the outer peripheral wall 90 is omitted.
  • the oil OL for cooling the coil ends 253a and 253b can be stored in the parts of the cover members 9A and 9B. Even with this configuration, the same effects as in the case of the cover members 9A and 9B described above can be exhibited.
  • the case where the cover members 9A and 9B have a symmetrical shape with the rotor core 21 interposed therebetween is exemplified.
  • the shapes of the cover members 9A and 9B are not limited to these shapes.
  • the cover members 9A and 9B may have an asymmetrical shape with the rotor core 21 interposed therebetween.
  • the cover member 9A may have a shape that wraps the entire surface of the coil end 253a
  • the cover member 9B may have a shape that wraps a part of the coil end 253b (for example, around the end face 253b3).
  • the power transmission device 1 (device) according to the present embodiment has the following configuration.
  • the power transmission device 1 is Motor 2 (rotary machine) and It has a storage chamber K to which oil OL is supplied and which houses at least a part of the coil ends 253a and 253b of the stator core 25 of the motor 2.
  • the cooling efficiency of the stator core 25 of the motor 2 can be improved.
  • the coil ends 253a and 253b can be cooled by submerging at least a part of the coil ends 253a and 253b in the supplied oil OL in the storage chamber K. That is, the oil OL is supplied to the storage chamber K (the space surrounded by the cover members 9A and 9B) in which at least a part of the coil ends 253a and 253b is wrapped, and the oil OL flows through the storage chamber K.
  • the accommodation chamber K is a space surrounded by the outer peripheral wall 90, the inner peripheral wall 91, and the connecting wall 92 of the cover members 9A and 9B, respectively.
  • the power transmission device 1 has the following configuration.
  • the accommodation chamber K includes an inner peripheral wall 91 (wall portion) that partitions the rotor core 21 of the motor 2 and the stator core 25 of the motor 2.
  • the inner peripheral walls 91 and 91 of the cover members 9A and 9B are provided so as to cross between the outer periphery of the rotor core 21 and the coil ends 253a and 253b of the stator core 25 in the radial direction of the rotation axis X of the motor 2, respectively. ..
  • the space inside the motor chamber Sa can be partitioned by the inner peripheral wall 91, so that the accommodation chamber K can be secured in the motor chamber Sa.
  • the volume of the accommodation chamber K is smaller than the volume of the motor chamber Sa.
  • the oil OL can be supplied into the storage chamber K while suppressing the volume of the storage chamber K. Therefore, the amount of oil OL required for cooling the stator core 25 can be reduced.
  • the amount of oil OL acting on the rotor core 21 of the motor 2 can be reduced via the accommodation chamber K.
  • the rotational resistance of the rotor core 21 of the motor 2 can be reduced as compared with the case where both the rotor core 21 and the stator core 25 of the motor 2 are submerged together in oil.
  • the tip 91a of the inner peripheral wall 91 is in contact with the teeth portion 252 of the stator core 25 from the rotation axis X direction, and the oil OL leaks from the storage chamber K while being allowed to be suppressed (rotor core).
  • a sealing member may be provided at the tip 91a of the inner peripheral wall 91 so as to prevent oil OL from leaking from the storage chamber K.
  • the power transmission device 1 has the following configuration. (3)
  • the accommodation chamber K is formed so as to locally wrap the coil ends 253a and 253b of the stator core 25 of the motor 2.
  • the volume of the accommodation chamber K is configured as described above by locally wrapping only the coil ends 253a and 253b with the cover members 9A and 9B instead of wrapping the entire coil 253 of the stator core 25. Can be made smaller. As a result, it is possible to suitably prevent the volume of the motor chamber Sa from becoming large, so that the structure can be made advantageous in terms of layout.
  • the power transmission device 1 has the following configuration. (4)
  • the power transmission device 1 has a drive shaft DA and a DB (drive shaft) connected downstream of the motor 2 via a gear mechanism 3.
  • the drive shaft DA is arranged so as to pass outside the accommodation chamber K and pass through a position on the inner peripheral side of the accommodation chamber K.
  • the drive shaft DA By arranging the drive shaft DA so as to pass outside the accommodation chamber K in this way, it is possible to reduce the decrease in the airtightness of the accommodation chamber K. Further, a space in which the motor support portion 125 can be arranged is secured on the inner peripheral side of the accommodation chamber K so that the drive shaft DA passes through this space in the rotation axis X direction, so that the power transmission device 1 can be used. It is possible to preferably prevent the size from increasing in the radial direction.
  • the power transmission device 1 has the following configuration.
  • the storage chamber K has a through hole 901 (oil supply port) for supplying the oil OL into the storage chamber K and a through hole 903 (oil discharge port) for discharging the oil OL to the outside of the storage chamber K. ..
  • the through hole 903 is offset in the circumferential direction around the rotation axis X with respect to the through hole 901.
  • a flow of oil OL is formed inside the storage chamber K from the through hole 901 which is the supply port of the oil OL to the through hole 903 which is the discharge port of the oil OL.
  • a flow of oil OL is formed along the circumferential direction around the rotation axis X, so that the cooling efficiency of the stator core 25 is improved.
  • the power transmission device 1 has the following configuration. (6)
  • the accommodation chamber K is formed in a shape having a partition wall 95 (partition portion) for partitioning the internal space of the accommodation chamber K.
  • the through hole 901 and the through hole 903 are arranged adjacent to each other with the partition wall 95 interposed therebetween.
  • the cover members 9A and 9B form an annular shape that surrounds the rotation axis X over the entire circumference, and the ring-shaped (annular) storage chamber K is a partition when viewed from the rotation axis X direction.
  • the shape of the cover member is not limited to this embodiment.
  • the cover member may be formed in a C shape when viewed from the rotation axis X direction, for example.
  • the cover member has two wall portions provided between the through holes 901 and the through holes 903 adjacent to each other in the circumferential direction, and the region between the two wall portions is cut out to form a C-shape. It may be a thing.
  • the power transmission device 1 has the following configuration. (7)
  • the partition wall 95 is arranged above the horizontal line HL passing through the rotation axis X (rotation center) of the motor 2.
  • the partition wall 95, the through hole 901, and the through hole 903 are arranged above the horizon HL.
  • the oil OL flowing in from the through hole 901 flows downward due to the force of gravity.
  • the oil OL in the accommodation chamber K is pushed by the oil OL sequentially flowing from the through hole 901 and moves to the through hole 903 side, so that the coil ends 253a and 253b of the stator core 25 are submerged in the accommodation chamber K.
  • the structure is easy to use. Therefore, the cooling efficiency of the stator core 25 is improved.
  • FIG. 18 is a diagram illustrating a power transmission device 1A according to a modified example.
  • FIG. 19 is an enlarged view of a main part of the power transmission device 1A, and is an enlarged view of a region A in FIG.
  • FIG. 20 is an enlarged view of a main part of the power transmission device 1A, and is an enlarged view of a region B in FIG.
  • FIG. 21 is a diagram illustrating a flow of oil OL around the coil end 253a.
  • FIG. 21 is a schematic view of a cross section taken along the line CC of FIG.
  • FIG. 22 is a diagram illustrating a flow of oil OL around the coil end 253b.
  • FIG. 22 is a schematic view of the DD cross section of FIG. FIG.
  • FIG. 23 is a diagram illustrating the partition walls 95A and 95B.
  • FIG. 23 is a schematic view of a cross section taken along the line AA of FIG. 22.
  • the oil holes 190 and 191 are shown by broken lines.
  • the sizes of the sealing members 9C and 9D are exaggerated and described.
  • the drive shaft DA is shown by a broken line.
  • cross-hatching is attached to the partition walls 95A and 95B for easy viewing.
  • the accommodation chambers KA and KB are formed in the motor chamber Sa by using the seal members 9C and 9D instead of the cover members 9A and 9B described above. ing.
  • the seal members 9C and 9D have a tubular shape.
  • the seal members 9C and 9D are heat-resistant parts.
  • the seat members 9C and 9D are inserted between the coil ends 253a and 253b of the stator core 25 and the motor support portions 135 and 125, respectively.
  • the seal member 9C has a small diameter portion 960, a large diameter portion 961, and a connecting portion 962 connecting the small diameter portion 960 and the large diameter portion 961.
  • the large diameter portion 961 is formed with an outer diameter that matches the inner diameter of the coil end 253a.
  • the large-diameter portion 961 is inserted into the coil end 253a from the rotation axis X direction until the tip 961a of the large-diameter portion 961 abuts on the side surface of the teeth portion 252.
  • the small diameter portion 960 is formed with an inner diameter that matches the outer diameter of the connection wall 136 of the motor support portion 135.
  • the small diameter portion 960 is extrapolated to the cylindrical connecting wall 136 from the rotation axis X direction and fixed to the outer periphery of the connecting wall 136.
  • the connecting portion 962 is inclined so that the inner diameter becomes smaller toward the small diameter portion 960 from the large diameter portion 961.
  • the connecting portion 962 expands in diameter from the small diameter portion 960 toward the large diameter portion 961 in the rotation axis X direction, and the large diameter portion 961 and the small diameter portion 960 can be elastically displaced in the radial direction of the rotation shaft X.
  • the large diameter portion 961 of the seal member 9C is elastically pressed against the inner circumference of the coil end 253a and has a small diameter portion.
  • the 960 is elastically pressed against the outer periphery of the connecting wall 136.
  • the outer peripheral surface 253a1 faces the support wall portion 111 of the first box 11A at a distance in the radial direction of the rotation axis X.
  • the inner peripheral surface 253a2 faces the motor support portion 135 of the third box 13 at intervals in the radial direction of the rotation axis X.
  • the end faces 253a3 face the wall portion 130 of the third box 13 at intervals in the rotation axis X direction.
  • the accommodation chamber KA surrounded by the support wall portion 111, the wall portion 130, the connection wall 136, and the seal member 9C is formed. Then, in this accommodation chamber KA, the coil end 253a of the stator core 25 is exposed. That is, the seal member 9C constitutes a wall portion that separates the rotor core 21 and the stator core 25.
  • an oil hole 170a of the oil passage 170 is opened in a region facing the outer peripheral surface 253a1 of the coil end 253a. Therefore, the cooling oil OL is supplied into the storage chamber KA via the oil passage 170.
  • the seal member 9D has a small diameter portion 970, a large diameter portion 971, and a connecting portion 972 connecting the small diameter portion 970 and the large diameter portion 971.
  • the large diameter portion 971 is formed with an outer diameter that matches the inner diameter of the coil end 253b.
  • the large-diameter portion 971 is inserted into the coil end 253b from the rotation axis X direction until the tip 971a of the large-diameter portion 971 abuts on the side surface of the teeth portion 252.
  • the small diameter portion 970 is formed with an inner diameter that matches the outer diameter of the motor support portion 125.
  • the small diameter portion 970 is extrapolated to the cylindrical motor support portion 125 from the rotation axis X direction and fixed to the outer periphery of the motor support portion 125.
  • the connecting portion 972 is inclined so that the inner diameter becomes smaller toward the small diameter portion 970 from the large diameter portion 971.
  • the connecting portion 972 expands in diameter from the small diameter portion 970 toward the large diameter portion 971 in the rotation axis X direction, and the large diameter portion 971 and the small diameter portion 970 can be elastically displaced in the radial direction of the rotation shaft X.
  • the large diameter portion 971 of the seal member 9D is elastically pressed against the inner circumference of the coil end 253b and has a small diameter portion.
  • the 970 is elastically pressed against the outer periphery of the support wall portion 125.
  • the outer peripheral surface 253b1 faces the support wall portion 111 of the first box 11A at a distance in the radial direction of the rotation axis X.
  • the inner peripheral surface 253b2 faces the motor support portion 125 at a distance in the radial direction of the rotation axis X.
  • the end face 253b3 faces the wall portion 120 of the second box 12A at a distance in the rotation axis X direction.
  • a storage chamber KB surrounded by the support wall portion 111, the wall portion 120, the support wall portion 125, and the seal member 9D is formed. Then, in this accommodation chamber KB, the coil end 253b of the stator core 25 is exposed. That is, the seal member 9D constitutes a wall portion that partitions the rotor core 21 and the stator core 25.
  • an oil hole 171a of the oil passage 171 is opened in a region facing the outer peripheral surface 253b1 of the coil end 253b. Therefore, the cooling oil OL is supplied into the storage chamber KB via the oil passage 171.
  • oil holes are formed on the inner circumference of the support wall portion 111 of the first box 11A. 190 and 191 are open.
  • the oil hole 190 is located above the horizontal line HL passing through the rotation axis X together with the oil passage 170. Further, when viewed from the rotation axis X direction, the oil hole 190 communicates with the accommodation chamber KA below the oil passage 170 in the vertical line VL direction. When viewed from the rotation axis X direction, the oil holes 190 and the oil passage 170 are provided in an adjacent positional relationship with their positions shifted in the circumferential direction around the rotation axis X. That is, when viewed from the rotation axis X direction, the oil hole 190 is offset in the circumferential direction around the rotation axis X with respect to the oil passage 170.
  • the oil hole 191 is located above the horizontal line HL passing through the rotation axis X together with the oil passage 171. Further, when viewed from the rotation axis X direction, the oil hole 191 is connected to the accommodation chamber KB below the oil passage 171 in the vertical line VL direction. When viewed from the rotation axis X direction, the oil holes 191 and the oil passage 171 are provided in an adjacent positional relationship with their positions shifted in the circumferential direction around the rotation axis X. That is, when viewed from the rotation axis X direction, the oil hole 191 is offset in the circumferential direction around the rotation axis X with respect to the oil passage 171.
  • ribs 127 and 129 are provided on the peripheral wall portion 121A of the second box 12A (see FIGS. 21 and 22).
  • the ribs 127 and 129 each bulge outward from the outer peripheral 121c of the peripheral wall portion 121A.
  • the ribs 127 and 129 extend along the circumferential direction around the rotation axis X.
  • the ribs 127 and 129 are formed in a range that crosses the horizontal line HL from the upper side to the lower side in the vertical line VL direction.
  • Oil passages 182 and 183 into which the oil OL flows are formed in the ribs 127 and 129, respectively.
  • the oil passages 182 and 183 also extend along the circumferential direction around the axis of rotation X and are formed in a range that crosses the horizontal line HL from the upper side to the lower side in the vertical line VL direction.
  • the oil passages 182 and 183 connect the oil holes 190 and 191 described above to the oil holes 192 and 193 that open in the oil reservoir 128.
  • the storage chambers KA and KB inside the support wall portion 111 communicate with the oil reservoir portion 128 via the oil passages 182 and 183.
  • the partition walls 95A and 95B are provided, respectively.
  • the partition walls 95A and 95B form a partition portion that partitions the internal spaces of the accommodation chambers KA and KB, respectively.
  • the partition walls 95A and 95B are located above the horizontal line HL passing through the rotation axis X.
  • the partition walls 95A and 95B form a flow path of the oil OL that makes a substantially circular rotation around the rotation axis X in the circumferential direction.
  • an oil passage 170 is opened on one end side of the flow path.
  • the oil passage 170 serves as a supply port for oil OL to the accommodation chamber KA.
  • an oil hole 190 is opened on the other end side of the flow path.
  • the oil hole 190 is a discharge port for oil OL from the storage chamber KA.
  • an oil passage 171 is opened on one end side of the flow path.
  • the oil passage 171 is a supply port for oil OL to the accommodation chamber KB.
  • an oil hole 191 is opened on the other end side of the flow path.
  • the oil hole 191 is a discharge port for oil OL from the storage chamber KB.
  • the partition wall 95A is provided from the stator core 25 to the wall portion 130 across the accommodation chamber KA in the rotation axis X direction.
  • the partition wall 95B is provided from the stator core 25 to the wall portion 120 across the accommodation chamber KB in the rotation axis X direction.
  • partition walls 95A and 95B are provided inside the accommodation chambers KA and KB.
  • the oil having the partition walls 95A and 95B substantially circles in the circumferential direction around the rotation axis X from the area where the oil passages 170 and 171 are provided to the area where the oil holes 190 and 191 are provided.
  • An OL flow path is formed.
  • the oil holes 190 and 191 are opened below the oil passages 170 and 171 (oil holes 170a and 171a) by a height h. Therefore, the oil OL that has flowed into the storage chambers KA and KB can be stored in the storage chambers KA and KB up to the height of the lower ends of the oil holes 190 and 191.
  • Oil OL continuously flows into the accommodation chambers KA and KB from the oil passages 170 and 171 respectively.
  • the oil OL that has flowed into the accommodation chambers KA and KB flows through the accommodation chambers KA and KB in one direction (in the figure, in the arrow direction) in the circumferential direction around the rotation axis X, respectively.
  • the oil OL that has passed through the storage chambers KA and KB is discharged from the oil holes 190 and 191 to the oil passages 182 and 183 that are outside the storage chambers KA and KB, respectively.
  • the coil ends 253a and 253b are submerged in the oil OL in the accommodation chambers KA and KB over the entire circumference in the circumferential direction.
  • the coil ends 253a and 253b are cooled as the oil OL moves through the accommodation chambers KA and KB toward the oil holes 190 and 191.
  • the oil OL discharged from the accommodation chambers KA and KB moves downward in the oil passages 182 and 183 due to its own weight.
  • the oil OL in the oil passages 182 and 183 is held at the same height as the height of the oil OL in the main body box 10.
  • the oil OL that has flowed into the oil reservoir 128 side flows into the gear chamber Sb and is scraped up again by the rotating differential case 50. Then, a part of the scraped oil OL is supplied into the motor chamber Sa (accommodation chamber KA, KB) via the oil passage 126a and used for cooling the motor 2. Therefore, when the electric vehicle EV equipped with the power transmission device 1A is traveling, at least the coil ends 253a and 253b are continuously cooled by the oil OL supplied through the oil passages 170 and 171.
  • the power transmission device 1A has the following configuration.
  • the power transmission device 1A is Motor 2 (rotary machine) and It is supplied with oil OL and has accommodation chambers KA and KB that enclose at least a part of the coil ends 253a and 253b of the stator core 25 of the motor 2.
  • the coil ends 253a and 253b can be cooled by allowing at least a part of the coil ends 253a and 253b to be submerged in the supplied oil OL in the accommodation chambers KA and KB. That is, the oil OL is supplied to the accommodating chambers KA and KB in which at least a part of the coil ends 253a and 253b is enclosed so that the oil OL can flow in the accommodating chambers KA and KB so that the motor 2 can flow.
  • the cooling efficiency of the stator core 25 can be improved.
  • the accommodation chamber KA is a space surrounded by the support wall portion 111 of the first box 11A, the wall portion 130 of the third box 13, the connection wall 136 of the third box 13, and the seal member 9C.
  • the accommodation chamber KB is a space surrounded by the support wall portion 111 of the first box 11A, the wall portion 120 of the second box 12A, the motor support portion 125 of the second box 12A, and the seal member 9D.
  • the power transmission device 1A has the following configuration.
  • the accommodation chamber KA includes a seal member 9C (wall portion) that partitions the rotor core 21 of the motor 2 and the stator core 25 of the motor 2.
  • the accommodation chamber KB includes a seal member 9D (wall portion) that partitions the rotor core 21 of the motor 2 and the stator core 25 of the motor 2.
  • the seal members 9C and 9D are provided so as to cross the outer periphery of the rotor core 21 and the coil ends 253a and 253b of the stator core 25 in the radial direction of the rotation axis X of the motor 2, respectively.
  • the accommodation chambers KA and KB can be secured in the motor chamber Sa.
  • the oil OL can be supplied into the accommodation chambers KA and KB while suppressing the volumes of the accommodation chambers KA and KB, so that the amount of oil OL required for cooling the stator core 25 can be reduced.
  • the amount of oil OL acting on the rotor core 21 of the motor 2 can be reduced via the accommodation chambers KA and KB, it is compared with the case where both the rotor core 21 and the stator core 25 of the motor 2 are submerged in oil together. Therefore, the rotational resistance of the rotor core 21 of the motor 2 can be reduced.
  • the power transmission device 1A has the following configuration. (10) The power transmission device 1A has a gear mechanism 3 downstream of the motor 2. A wall portion 120 (partition wall) provided between the gear mechanism 3 and the motor 2 is configured as a part of the accommodation chamber KB.
  • the power transmission device 1A has the following configuration.
  • the storage chamber KA has an oil passage 170 (oil supply port) for supplying the oil OL into the storage chamber KA, and an oil hole 190 (oil discharge port) for discharging the oil OL to the outside of the storage chamber KA. ..
  • the oil hole 190 is offset in the circumferential direction around the rotation axis X with respect to the oil passage 170.
  • the storage chamber KB has an oil passage 171 (oil supply port) for supplying the oil OL into the storage chamber KB, and an oil hole 191 (oil discharge port) for discharging the oil OL to the outside of the storage chamber KB.
  • the oil hole 191 is offset in the circumferential direction around the rotation axis X with respect to the oil passage 171.
  • an oil OL flow is formed inside the accommodation chambers KA and KB from the oil passages 170 and 171 which are oil OL supply ports to the oil holes 190 and 191 which are oil OL discharge ports. Ru.
  • a flow of oil OL is formed along the circumferential direction around the rotation axis X, so that the cooling efficiency of the stator core 25 is improved.
  • the power transmission device 1A has the following configuration. (12)
  • the accommodation chamber KA has a partition wall 95A (partition portion) that partitions the internal space of the accommodation chamber KA.
  • the oil passage 170 and the oil hole 190 are arranged adjacent to each other with the partition wall 95A interposed therebetween.
  • the accommodation chamber KB has a partition wall 95B (partition portion) that partitions the internal space of the accommodation chamber KB.
  • the oil passage 171 and the oil hole 191 are arranged adjacent to each other with the partition wall 95B interposed therebetween.
  • a method of catching the oil OL scraped up by the rotation of the differential case 50 by the oil catching portion 15 and supplying it from the oil passage 126a into the storage chamber K has been exemplified, but the present invention is not limited to this embodiment.
  • the oil OL stored in the main body box 10 may be sucked by the oil pump and the oil OL may be supplied to the storage chamber K via a pipe extending from the oil pump.
  • the device is a power transmission device (power train device (transmission, reduction gear, etc.)) of an electric vehicle EV equipped with a motor
  • the device may be a device equipped with a motor.
  • any device provided with a motor can be applied to devices other than electric vehicles.
  • the gear mechanism is the entire mechanism including the gear.
  • the gear mechanism 3 is composed of a planetary reduction gear 4 and a differential mechanism 5 (differential gear).
  • downstream connection in the present specification means that there is a connection relationship in which power is transmitted from a component arranged upstream to a component arranged downstream.
  • a planetary reduction gear connected to the downstream of a motor (rotary electric machine)
  • power is transmitted from the motor 2 to the planetary reduction gear.
  • the gear mechanism 3 may be connected downstream of the motor 2 via a speed change mechanism (a mechanism having a speed change function (including a stepped speed change mechanism and a stepless speed change mechanism)), a clutch, or the like.
  • the power of the motor 2 is transmitted to the gear mechanism 3 via the speed change mechanism, the clutch, and the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Details Of Gearings (AREA)

Abstract

Le problème décrit par la présente invention est d'améliorer l'efficacité de refroidissement du stator d'une machine électrique rotative. La solution selon l'invention porte sur un dispositif qui comprend une machine électrique rotative et une chambre de logement qui est alimentée en une huile et recouvre au moins une partie de l'extrémité de bobine du stator de la machine électrique rotative.
PCT/JP2021/032966 2020-10-07 2021-09-08 Dispositif WO2022074996A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020169852 2020-10-07
JP2020-169852 2020-10-07

Publications (1)

Publication Number Publication Date
WO2022074996A1 true WO2022074996A1 (fr) 2022-04-14

Family

ID=81126461

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/032966 WO2022074996A1 (fr) 2020-10-07 2021-09-08 Dispositif

Country Status (1)

Country Link
WO (1) WO2022074996A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010124657A (ja) * 2008-11-21 2010-06-03 Toyota Motor Corp 回転電機
JP4919108B2 (ja) * 2009-03-26 2012-04-18 アイシン・エィ・ダブリュ株式会社 ステータ
JP2012253869A (ja) * 2011-06-01 2012-12-20 Ihi Corp 回転機
JP5772832B2 (ja) * 2010-12-22 2015-09-02 株式会社Ihi 回転機
JP6197462B2 (ja) * 2013-08-06 2017-09-20 日産自動車株式会社 ステータコイルの冷却構造及びステータコイルの冷却構造の製造方法
WO2019073821A1 (fr) * 2017-10-13 2019-04-18 アイシン・エィ・ダブリュ株式会社 Dispositif d'entraînement pour véhicule
JP2019154146A (ja) * 2018-03-02 2019-09-12 本田技研工業株式会社 回転電機

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010124657A (ja) * 2008-11-21 2010-06-03 Toyota Motor Corp 回転電機
JP4919108B2 (ja) * 2009-03-26 2012-04-18 アイシン・エィ・ダブリュ株式会社 ステータ
JP5772832B2 (ja) * 2010-12-22 2015-09-02 株式会社Ihi 回転機
JP2012253869A (ja) * 2011-06-01 2012-12-20 Ihi Corp 回転機
JP6197462B2 (ja) * 2013-08-06 2017-09-20 日産自動車株式会社 ステータコイルの冷却構造及びステータコイルの冷却構造の製造方法
WO2019073821A1 (fr) * 2017-10-13 2019-04-18 アイシン・エィ・ダブリュ株式会社 Dispositif d'entraînement pour véhicule
JP2019154146A (ja) * 2018-03-02 2019-09-12 本田技研工業株式会社 回転電機

Similar Documents

Publication Publication Date Title
JP7066311B2 (ja) 動力伝達装置
WO2021137284A1 (fr) Dispositif de transmission de puissance
WO2022074997A1 (fr) Dispositif de transmission d'énergie
WO2022270211A1 (fr) Unité
WO2021157235A1 (fr) Dispositif de transmission d'énergie
WO2021137278A1 (fr) Dispositif de transmission de puissance
JP7573932B2 (ja) 動力伝達装置
WO2022074996A1 (fr) Dispositif
WO2022270217A1 (fr) Unité
WO2022270213A1 (fr) Unité
WO2021157236A1 (fr) Dispositif de transmission d'énergie et véhicule automobile
WO2022270212A1 (fr) Unité
WO2022270214A1 (fr) Unité
WO2021137281A1 (fr) Dispositif de transmission de puissance
JP7350450B2 (ja) 動力伝達装置
JP7321950B2 (ja) 動力伝達装置
JP7415106B2 (ja) 動力伝達装置
WO2021137280A1 (fr) Dispositif de transmission de puissance
WO2021137287A1 (fr) Dispositif de transmission de puissance
JP7371310B2 (ja) 動力伝達装置
JP7415105B2 (ja) 動力伝達装置
JP7375262B2 (ja) 動力伝達装置
US11859707B2 (en) Power transmission device
WO2021137279A1 (fr) Dispositif de transmission de puissance
JP2021110337A (ja) 動力伝達装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21877299

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21877299

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP