JP4857327B2 - Vehicle motor unit - Google Patents

Description

  The present invention relates to a vehicle motor unit.

2. Description of the Related Art Conventionally, there is provided a motor including a rotor that is rotatably supported around an axis, a permanent magnet is disposed, and a stator that is disposed to face the periphery of the rotor and is wound with a coil (conductor). A vehicular motor unit is known. When the motor configured as described above is driven, the coil generates heat due to the current flowing through the coil. In particular, the coil is arranged so as to bridge between slots formed in the stator, and it is known that the connecting portion (projecting portion) becomes high temperature. In view of this, a motor has been proposed that aims to suppress a temperature rise due to heat generated by the protrusion by supplying a refrigerant to the protrusion of the coil (see, for example, Patent Document 1).
The motor of Patent Document 1 is wound around a slot formed in a stator and has a coil (winding) having a protruding portion protruding from the slot, a guide covering the outer peripheral side of the protruding portion, and an outer periphery of the stator. And a housing arranged on the side. An in-housing channel is formed between the guide and the housing, and a communication hole is formed in the guide to communicate the in-housing channel and the inside of the guide (coil protrusion).
JP 2006-5984 A

  By the way, in the motor of Patent Document 1 described above, the refrigerant flows through a flow path (groove) in the housing formed in the guide in a state where the housing and the guide are closely arranged. There is a problem that the refrigerant leaks from the gap between the housing and the guide, and the refrigerant cannot be uniformly supplied to the protruding portion of the coil.

  Therefore, the present invention has been made in view of the above circumstances, and provides a vehicle motor unit that can effectively suppress an increase in coil temperature.

  In order to solve the above problems, the invention described in claim 1 includes a stator (for example, the stator 21 in the embodiment) in which a conducting wire (for example, the coil 17 in the embodiment) is wound in a slot, A motor (for example, the motor 23 in the embodiment) in which a protruding portion (for example, the protruding portion 18 in the embodiment) is formed by the conductive wire at the axial end portion of the stator, and a motor housing (for example, the embodiment) that stores the motor In a vehicle motor unit (for example, the motor unit 10 in the embodiment) provided with a motor housing 11) and a cooling device that supplies cooling oil into the motor housing, a guide (for example, implementation) that covers the protruding portion Guide 50) and cooling oil introduction formed in the vicinity of the protrusion in the motor housing (For example, the cooling oil introduction port 42 in the embodiment) and a groove (for example, the groove portion 44 in the embodiment) having an opening on the outer peripheral side along the circumferential direction of the motor housing are formed, and the groove is the cooling oil. An oil ring (for example, the oil ring 45 in the embodiment) that is press-fitted into the inner peripheral side of the motor housing so as to cover the introduction port, and a through hole (for example, the through hole in the embodiment) in the groove of the oil ring 48) is formed, and a guide hole (for example, guide hole 51 in the embodiment) is formed at a position corresponding to the through hole in the guide so that the cooling oil flowing out from the through hole is supplied to the protrusion. It is characterized by being formed.

  According to a second aspect of the present invention, the through-hole has a center line (for example, the height in the axial direction of the bulging portion (for example, the bulging portion 19 in the embodiment) where the conductive wire intersects the protruding portion. It is characterized by being formed in a staggered manner with the intermediate point C) in the embodiment as a boundary.

  According to a third aspect of the present invention, a gap (for example, the gap D1 in the embodiment) is formed between the stator and the motor housing in the radial direction of the motor, and both axial ends of the gap are formed by the guide. A stator cooling oil introduction section (for example, the embodiment) that closes to form a stator cooling space (for example, the stator cooling space 40 in the embodiment) and introduces the cooling oil to a position facing the stator cooling space in the motor housing. The stator cooling oil introduction port 60) is formed.

  According to a fourth aspect of the present invention, the stator cooling oil introduction portion has an introduction hole (for example, the introduction hole 62 in the embodiment) so that the cooling oil is evenly scattered in four directions in a plan view. It is characterized by that.

  According to a fifth aspect of the present invention, a wall portion (for example, in the embodiment) is provided on at least one of the inner peripheral side of the oil ring and the outer peripheral side of the guide so as to cover the through hole. A wall portion 71 or a wall portion 72) is formed.

  The invention described in claim 6 is characterized in that the wall portion is inclined in a direction directed to the guide hole.

  The invention described in claim 7 is characterized in that an area of the guide hole is formed larger than an area of the through hole.

  According to the first aspect of the present invention, since the oil ring is press-fitted into the inner peripheral side of the motor housing so as to cover the cooling oil inlet formed in the motor housing, the inner peripheral surface of the motor housing, the groove of the oil ring, In addition, an oil passage for the cooling oil is formed between them, and leakage of the cooling oil can be prevented. Further, the cooling oil supplied to the groove of the oil ring is jetted from the through hole formed in the oil ring toward the guide, and then guided into the guide from the guide hole formed in the guide. Therefore, since cooling oil is supplied over the whole protrusion part of conducting wire, the temperature rise of conducting wire can be suppressed effectively.

  According to the second aspect of the present invention, since the cooling oil can be efficiently supplied to the entire protrusion, the temperature rise of the conducting wire can be more effectively suppressed.

  According to the third aspect of the present invention, since the stator cooling space is formed as a closed space by the motor housing, the stator, and the guide, the cooling oil supplied from the stator cooling oil introducing portion does not leak and the stator cooling space. Therefore, the stator can be efficiently cooled.

  According to the fourth aspect of the present invention, since the cooling oil can be reliably supplied to the entire surface of the stator in a short time, the stator can be efficiently cooled.

  According to the invention described in claim 5, by forming the wall portion, it is possible to suppress scattering of the cooling oil injected from the oil ring toward the guide. Moreover, scattering of the cooling oil discharged from the through hole due to vibration or the like can be prevented.

  According to the sixth aspect of the present invention, the cooling oil attached to the wall portion does not stay between the oil ring and the guide, and the cooling oil can be smoothly guided from the guide hole to the inside of the guide.

  According to the seventh aspect of the present invention, the cooling oil injected from the through hole of the oil ring can be more reliably captured by the guide hole and guided into the guide. Therefore, the temperature rise of the conducting wire can be effectively suppressed.

Next, an embodiment of the present invention will be described with reference to FIGS. In addition, the definition which shows the attachment direction and position of each apparatus in this embodiment shall define the left-right direction and an up-down direction toward a vehicle advancing direction by making a vehicle advancing direction ahead.
FIG. 1 is a schematic sectional view of a vehicle motor unit. As shown in FIG. 1, a vehicle motor unit (hereinafter referred to as a motor unit) 10 is fastened to a motor housing 11 that houses a motor 23 having a stator 21 and a rotor 22, and one side of the motor housing 11. A transmission housing 12 that houses a power transmission unit (not shown) that transmits power from the output shaft 24 of the motor 23, and a sensor housing 13 that is fastened to the other side of the motor housing 11 and houses the rotation sensor 25 of the motor 23. It is equipped with.

  Slots (not shown) are formed in the stator 21 at equal intervals along the circumferential direction, and a coil 17 is wound around the slots. Since the coil 17 is wound so as to bridge between the slots of the stator 21, a protruding portion 18 that protrudes from both axial end surfaces of the stator 21 is formed. Further, a bulging portion 19 is further formed at a location where the coils 17 intersect each other in the protruding portion 18. The bulging portion 19 is formed so as to expand in the radial direction of the stator 21 with respect to the protruding portion 18.

  The mission housing 12 includes a common housing 12A fastened to the motor housing 11 and a gear housing 12B fastened to the common housing 12A. The motor housing 11 is configured as a motor chamber 36, the mission housing 12 is configured as a mission chamber 37, and the sensor housing 13 is configured as a sensor chamber 38.

  The motor housing 11 is formed in a substantially cylindrical shape so as to cover the entire motor 23. A bearing 26 that rotatably supports one end of the output shaft 24 of the motor 23 is provided on the mission housing 12 side of the boundary between the motor housing 11 and the mission housing 12, and the boundary between the motor housing 11 and the sensor housing 13. On the sensor housing 13 side, a bearing 27 that rotatably supports the other end of the output shaft 24 of the motor 23 is provided.

  Cooling oil passages 35 communicating with each other are formed in the wall portion 31 of the motor housing 11, the wall portion 32 of the transmission housing 12, and the wall portion 33 of the sensor housing 13, respectively. The cooling oil passage 35 is formed near the top of the motor unit 10.

  Here, a gap D1 (see FIG. 2) is formed over the entire circumference between the inner peripheral surface 15 of the motor housing 11 and the outer peripheral surface 16 of the stator 21, and will be described later at both axial ends of the gap D1. The stator cooling space 40 is formed by being closed by the guide 50.

  Further, a breather chamber 41 for separating the lubricating oil used in the motor unit 10 is formed in the mission housing 12. That is, the lubricating oil scattered by the rotation of the power transmission unit (gear) and the motor 23 can be separated in the breather chamber 41, and the lubricating oil leaks to the outside from the breather pipe 39 provided in the breather chamber 41 and communicating with the outside. This can be prevented. The breather chamber 41 communicates with the motor chamber 36, the mission chamber 37, and the sensor chamber 38 via a breather passage (not shown).

  As shown in FIG. 2, in the present embodiment, a cooling oil inlet 42 is formed so as to face the position where the protruding portion 18 is formed in the cooling oil passage 35. Further, an oil ring 45 having a groove portion 44 is press-fitted and attached to the inner peripheral surface 15 of the motor housing 11 so as to cover the cooling oil inlet 42.

  As shown in FIG. 3, the oil ring 45 is a ring-shaped member made of a metal such as stainless steel. The oil ring 45 is formed with a flat plate portion 46 along the circumferential direction, and a pair of wall portions 47, 47 are erected along the circumferential direction on the outer peripheral surface side of the flat plate portion 46. , 47 is configured as a groove 44. A plurality of circular through holes 48 are formed in the flat plate portion 46 of the oil ring 45 (the bottom of the groove portion 44). The through hole 48 is formed so as to correspond to a guide hole 51 formed in a guide 50 described later. As shown in FIG. 4, the through-holes 48 are staggered with respect to the position of the intermediate point C (see FIG. 2) at the height H <b> 1 in the axial direction of the bulging portion 19 formed in the protruding portion 18. It is formed so that it can be distributed. Further, the groove portion 44 and the through hole 48 are formed only in the upper half region in the circumferential direction of the oil ring 45.

  The oil ring 45 is press-fitted and attached to the inner peripheral surface 15 of the motor housing 11, but positioning protrusions and grooves may be formed on the oil ring 45 and the motor housing 11. Moreover, since the through-hole 48 is not formed in the oil ring 45 over the perimeter, when attaching the oil ring 45, marking etc. may be given so that the vertical relationship of the oil ring 45 may not be mistaken.

  Returning to FIG. 2, a guide 50 is provided so as to cover the protrusion 18 of the coil 17. The guide 50 is a ring-shaped member in which a housing recess 52 is formed so as to cover the entire circumference of the protruding portion 18 in the circumferential direction. The guide 50 is made of, for example, resin. The guides 50 are attached so as to cover the protruding portions 18 formed at both ends of the stator 21 in the axial direction. The protruding portion 18 of the coil 17 is formed by winding the coil 17 around the stator 21 and then pressing it with a predetermined force so that the height is constant.

  As shown in FIG. 5, a plurality of guide holes 51 for introducing cooling oil into the guide 50 are formed in the outer peripheral surface 53 of the guide 50. In the present embodiment, the guide holes 51 are formed in an elongated rectangular shape along the circumferential direction, and three guide holes 51 are formed at about 60 ° only in the upper half region in the circumferential direction of the guide 50. That is, the guide hole 51 is formed at a position corresponding to the through hole 48 of the oil ring 45. The width L1 of the guide hole 51 is formed larger than the diameter L2 of the through hole 48. Further, a flange portion 54 is formed on one end side of the outer peripheral surface 53 of the guide 50 so as to protrude outward in the radial direction. The radially outer end surface 55 of the flange portion 54 is in contact with the inner peripheral surface 15 of the motor housing 11. Further, the flange portion 54 is formed over substantially the entire circumference of the guide 50, and a notch portion 56 for discharging the cooling oil that has passed through the stator cooling space 40 is formed at the lowermost end portion. . The notch 56 may be formed only in one of the two guides 50 arranged. Furthermore, a discharge hole 57 for discharging the cooling oil after cooling the protrusion 18 disposed inside the guide 50 from the guide 50 is formed at the lowermost end portion of the outer peripheral surface 53 of the guide 50. .

  Returning to FIG. 2, a stator cooling oil inlet 60 is formed at a position corresponding to the stator cooling space 40 in the cooling oil passage 35. Further, an injection member 61 for injecting the cooling oil in a desired direction is attached to the stator cooling oil introduction port 60 on the inner peripheral surface 15 side of the motor housing 11. As shown in FIG. 6, the injection member 61 has four introduction holes 62 formed therein. The introduction holes 62 are formed so that the cooling oil can be injected substantially uniformly in four directions in a plan view.

Next, a method for cooling the coil 17 (projecting portion 18) of the motor unit 10 configured as described above will be described.
First, the cooling oil supplied from a cooling oil supply source (not shown) is supplied to the cooling oil passage 35 of the motor housing 11. A part of this cooling oil flows from the cooling oil inlet 42 to the motor chamber 36 side. Then, the oil ring 45 is attached to the cooling oil introduction port 42 on the motor chamber 36 side by press fitting, and the cooling oil flows into the groove portion 44 of the oil ring 45. At this time, since the oil ring 45 is attached to the inner peripheral surface 15 of the motor housing 11 by press-fitting, the leakage of the cooling oil from the oil ring 45 can be suppressed.

  The cooling oil that has flowed into the groove portion 44 flows so as to fill the groove portion 44 and is injected from the through hole 48 formed in the flat plate portion 46 toward the protruding portion 18 side of the coil 17.

  The cooling oil injected from the through hole 48 is supplied from the guide hole 51 to the inside of the guide 50 (accommodating recess 52). Then, the protrusion 18 of the coil 17 is cooled by this cooling oil. The cooling oil is uniformly supplied from a predetermined position in the upper half of the protrusion 18 formed over the entire circumference of the stator 21. The cooling oil is evenly supplied to the lower half of the protrusion 18 by gravity. Since the through holes 48 are formed in a staggered manner so as to be distributed at the intermediate point C of the height H1 in the axial direction of the bulging portion 19 formed in the protruding portion 18, the entire protruding portion 18 (the entire axial direction) The cooling oil can be efficiently supplied over the above.

  Specifically, as shown in FIGS. 7 and 8, the through-hole formed in the distal end side of the bulging portion 19 formed in the protruding portion 18 of the coil 17 in the through-hole 48 formed in the oil ring 45. The cooling oil that has passed through the hole 48A passes through the guide hole 51 and is intensively supplied to the distal end side of the protruding portion 18 (see the arrow in FIG. 7), while the proximal end side of the protruding portion 18 of the coil 17 (stator) The cooling oil that has passed through the through-hole 48B formed on the side where the 21 is disposed passes through the guide hole 51 and is concentratedly supplied to the proximal end side of the protrusion 18 (see the arrow in FIG. 8). That is, the cooling oil is supplied uniformly over the entire protrusion 18. As shown in FIGS. 7 and 8, the through hole 48A is arranged at a position where the bulging portion 19 is formed, and the through hole 48B is located at a position where the bulging portion 19 is not formed. If arrange | positioned in this way, cooling oil will be efficiently supplied to the protrusion part 18 whole.

  The cooling oil that has flowed to the lowermost part of the guide 50 while cooling the protrusion 18 is discharged into the motor chamber 36 through the discharge hole 57 formed in the outer peripheral surface 53 of the guide 50. In this way, the protrusion 18 of the coil 17 is cooled.

Next, a method for cooling the stator 21 of the motor unit 10 will be described.
First, the cooling oil is supplied to the cooling oil passage 35 of the motor housing 11 as described above. A part of this cooling oil flows from the stator cooling oil introduction port 60 to the motor chamber 36 side. Then, the injection member 61 is attached to the motor chamber 36 side of the stator cooling oil introduction port 60, and the cooling oil is injected toward the outer peripheral surface 16 of the stator 21.

  At this time, the stator cooling space 40 which is a closed space is formed by the inner peripheral surface 15 of the motor housing 11, the outer peripheral surface 16 of the stator 21, and the flange portions 54 and 54 of the guides 50 and 50 provided at both axial ends of the stator 21. Has been. Therefore, the cooling oil injected from the injection member 61 is supplied to the outer peripheral surface 16 of the stator 21 and supplied into the stator cooling space 40. That is, the cooling oil can be prevented from leaking from the stator cooling space 40.

  The cooling oil flowing into the stator cooling space 40 flows downward along the outer peripheral surface 16 of the stator 21 while cooling the stator 21, and the cooling oil is evenly supplied below the stator 21 by gravity. In the injection member 61, four introduction holes 62 are formed so that the cooling oil is uniformly supplied to the stator 21.

  Cooling oil that has flowed to the lowermost part of the stator cooling space 40 while cooling the stator 21 is discharged into the motor chamber 36 from a notch 56 formed in the flange portion 54 of the guide 50. In this way, the stator 21 is cooled. Further, by reducing the gap D1 of the stator cooling space 40, the cooling oil can be retained in the gap. By doing in this way, the heat of the stator 21 can also be radiated from the motor housing 11 via the cooling oil.

  According to the present embodiment, the guide 50 that covers the protrusion 18 of the coil 17 is provided, the oil ring 45 is attached to the inner peripheral side of the motor housing 11 by press fitting, and the cooling oil is passed from the cooling oil passage 35 through the oil ring 45. In this way, the protrusion 18 can be cooled. Thus, since the oil ring 45 is press-fitted and fixed to the inner peripheral surface 15 of the motor housing 11 so as to cover the cooling oil inlet 42 formed in the motor housing 11, the groove portion 44 of the oil ring 45 serves as an oil for the cooling oil. It is possible to prevent the cooling oil from leaking into the motor chamber 36 while being formed as a path. The cooling oil supplied to the groove 44 of the oil ring 45 is jetted from the through hole 48 formed in the oil ring 45 toward the guide 50, and then from the guide hole 51 formed in the guide 50. It is guided to the inside (accommodating recess 52). Therefore, since cooling oil is supplied over the whole protrusion part 18 of the coil 17, the temperature rise of the coil 17 can be suppressed effectively.

  Further, since the through holes 48 are formed in a staggered manner with the intermediate point C of the height H1 in the axial direction of the bulging portion 19 formed in the protruding portion 18 as a boundary, the cooling oil is supplied to the protruding portion 18. It can supply efficiently by the whole, and can suppress the temperature rise of the coil 17 more effectively.

  Further, a gap D1 is formed between the inner circumferential surface 15 of the motor housing 11 and the outer circumferential surface 16 of the stator 21 in the radial direction of the motor 23, and both axial ends of the gap D1 are closed by the flange portions 54 of the guide 50. Since the stator cooling space 40 is formed and the stator cooling oil introduction port 60 for introducing the cooling oil into the stator cooling space 40 is formed, the cooling oil supplied to the stator cooling space 40 does not leak, and the stator 21 is made efficient. Can be cooled.

  In addition, since the injection member 61 is attached to the stator cooling oil introduction port 60 and the introduction hole 62 is formed in the injection member 61 so that the cooling oil is evenly scattered in four directions in a plan view, The cooling oil can be reliably supplied in a short time, and the stator 21 can be efficiently cooled.

  Furthermore, since the width L1 (area) of the guide hole 51 is formed so as to be larger than the diameter L2 (area) of the through hole 48, the coolant injected from the through hole 48 of the oil ring 45 is more reliably guided. It can be captured by the hole 51 and guided to the inside of the guide 50. Therefore, the temperature rise of the coil 17 can be effectively suppressed.

  In addition, as shown in FIG. 9, you may form a pair of wall parts 71 and 71 also in the inner peripheral side (side where a guide is distribute | arranged) of the flat plate part 46 of the oil ring 45. As shown in FIG. Furthermore, as shown in FIG. 10, the pair of wall portions 71, 71 may be inclined toward the guide hole 51.

Further, as shown in FIG. 11, a pair of wall portions 72, 72 may be formed so as to sandwich both sides of the outer peripheral surface 53 of the guide 50 where the guide holes 51 are formed. Furthermore, as shown in FIG. 12, the pair of wall portions 72, 72 may be inclined so that the distance decreases toward the guide hole 51.
And you may employ | adopt combining each about the oil ring 45 and the guide 50 which were shown in FIGS.

  Thus, by forming the wall part 71 and the wall part 72 in the oil ring 45 and the guide 50, the scattering of the cooling oil injected toward the guide 50 from the oil ring 45 can be suppressed. Moreover, scattering of the cooling oil discharged from the through hole 48 due to vibration or the like can be prevented. Further, by inclining the wall portion 71 and the wall portion 72, the cooling oil adhering to the wall portion 71 and the wall portion 72 does not stay between the oil ring 45 and the guide 50, and smoothly passes through the guide hole 51. Cooling oil can be guided into the guide 50.

The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the specific structure and shape described in the embodiment are merely examples, and can be changed as appropriate.
For example, in the present embodiment, the case where the through hole is formed in a circular shape and the guide hole is formed in a rectangular shape has been described, but the shape of the hole may be other shapes.

It is a schematic longitudinal cross-sectional view of the vehicle motor unit in the embodiment of the present invention. It is the A section enlarged view of FIG. It is a perspective view of the oil ring in the embodiment of the present invention. FIG. 4 is a partial plan view of FIG. 3. It is a perspective view of the guide in the embodiment of the present invention. It is a bottom view of the injection member in the embodiment of the present invention. It is a fragmentary sectional view of the motor unit for vehicles corresponding to the EE line of FIG. FIG. 4 is a partial cross-sectional view of the vehicle motor unit corresponding to the FF line. It is a fragmentary sectional view which shows another aspect of the oil ring in embodiment of this invention. It is a fragmentary sectional view which shows another aspect of the oil ring in embodiment of this invention. It is a fragmentary sectional view showing another mode of a guide in an embodiment of the present invention. It is a fragmentary sectional view which shows another aspect of the guide in embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Motor unit (motor unit for vehicles) 11 ... Motor housing 17 ... Coil (conductor) 18 ... Protruding part 19 ... Swelling part 21 ... Stator 23 ... Motor 40 ... Stator cooling space 42 ... Cooling oil inlet 44 ... Groove part ( Groove) 45 ... oil ring 48 ... through hole 50 ... guide 51 ... guide hole 60 ... stator cooling oil introduction port (stator cooling oil introduction part) 62 ... introduction hole 71 ... wall part 72 ... wall part C ... intermediate point (center line) D1 ... Gap

Claims (7)

A motor having a stator in which a conducting wire is wound in a slot, and a projecting portion formed by the conducting wire at an axial end of the stator;
A motor housing that houses the motor;
A vehicle motor unit comprising: a cooling device that supplies cooling oil into the motor housing;
A guide covering the protruding portion;
A cooling oil inlet formed in the vicinity of the protrusion in the motor housing;
A groove having an outer peripheral side opening along the circumferential direction of the motor housing, and an oil ring press-fitted into the inner peripheral side of the motor housing so as to cover the cooling oil inlet. ,
A through hole is formed in the groove of the oil ring,
A vehicle motor unit, wherein a guide hole is formed at a position corresponding to the through hole in the guide so that the cooling oil flowing out from the through hole is supplied to the protrusion.   The said through-hole is formed in a staggered manner with the center line of the axial height of the bulging part where the conducting wire intersects in the projecting part as a boundary. Vehicle motor unit.   A gap is formed between the stator and the motor housing in the radial direction of the motor, and both ends in the axial direction of the gap are closed with the guide to form a stator cooling space, and the stator cooling space in the motor housing 3. The vehicle motor unit according to claim 1, wherein a stator cooling oil introduction portion that introduces the cooling oil is formed at a position facing the surface.   4. The vehicle motor unit according to claim 3, wherein the stator cooling oil introduction portion is formed with introduction holes so that the cooling oil is evenly scattered in four directions in a plan view.   5. The wall portion is formed along the circumferential direction so as to cover the through hole on at least one of the inner peripheral side of the oil ring and the outer peripheral side of the guide. The motor unit for vehicles in any one of.   The vehicle motor unit according to claim 5, wherein the wall portion is inclined in a direction directed to the guide hole.   The vehicle motor unit according to any one of claims 1 to 6, wherein an area of the guide hole is formed larger than an area of the through hole.

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