JP5446892B2 - Motor cooling device - Google Patents

Description

  The present invention relates to a cooling device configured to cool a rotor and a stator by flowing or scattering lubricating oil outward in the radial direction of the rotor using centrifugal force generated by rotation of the rotor.

  The motor generates heat due to the inevitable loss caused by energizing the coil, and when lubricating oil is used, heat is generated due to the power loss caused by stirring the lubricating oil. Inconvenience such as reduction occurs. In particular, motors used in hybrid vehicles and electric vehicles are used in harsh environments where a large current is applied to obtain a large driving force, and driving and energy regeneration are repeated. It has become important. In addition, it is desirable that a motor used as a driving force source of a vehicle and a device related thereto be as small and light as possible in order to improve the in-vehicle performance.

  An apparatus developed against such a background is described in Patent Document 1. The device described in Patent Document 1 is a drive device for a hybrid vehicle, in which end plates are provided at both ends of the motor in the axial direction of the rotor, and the end plates are formed in an annular shape. A lubricating oil passage is formed in the radial direction from the inner peripheral surface to the outer peripheral surface. Therefore, in the invention described in Patent Document 1, when the rotor rotates, the lubricating oil that has passed through the bearing that supports the rotor reaches the inner peripheral end of the end plate by centrifugal force, and then passes through the lubricating oil passage. The rotor is sent to the outer peripheral side of the rotor, and in the process, the rotor is cooled and lubricating oil is sprayed onto the stator, and the stator is cooled by the lubricating oil.

JP 2003-169448 A

  The device described in Patent Document 1 described above is intended to enable cooling by changing the shape of a part of the rotor, and supplies the lubricating oil toward the stator. The lubricating oil passage is opened substantially perpendicularly to the inner peripheral surface of the stator. Accordingly, a sufficient amount of lubricating oil can be supplied to the inner peripheral surface of the stator, but the lubricating oil also flows in a large amount into a narrow gap between the rotor and the stator. Therefore, when the rotor rotates, a shearing force and a stirring force act on the lubricating oil in the gap, and accordingly, power loss may occur and heat may be generated. Furthermore, when the temperature of the rotor or the stator increases due to heat generation, there may be a problem such as demagnetization in which the magnetic force (or magnetic flux) decreases.

  The present invention has been made by paying attention to the above-described technical problems, and can efficiently perform cooling with lubricating oil, and can prevent or suppress power loss and heat generation due to stirring. The object is to provide a cooling device.

In order to achieve the above object, the invention of claim 1 is directed to a motor cooling apparatus in which a stator is concentrically arranged with a slight gap on the outer peripheral side of the rotor, and the rotor is cooled by oil. at least one end in the axial direction of, communicates with the said gap, said rotor negative pressure generating means for negative pressure is generated to suck from the gap provided we are by rotating, the negative pressure The generating means is an inclined flange portion extending from the outer peripheral surface of the rotor forming the gap to the side surface of the rotor, and the outer peripheral surface of the inclined flange portion gradually increases in outer diameter on the side surface side of the rotor. It is formed in an increasing taper shape,
An oil passage is formed between the outer peripheral surface of the inclined flange portion and the inner peripheral surface of the stator facing each other with a slight gap, and the oil passage communicates with the gap. Device .

According to a second aspect of the present invention, there is provided a motor cooling apparatus in which a stator is concentrically arranged with a slight gap on the outer peripheral side of the rotor, and the rotor is cooled by oil. At least one end in the axial direction of the rotor And a negative pressure generating means that communicates with the gap and generates a negative pressure by the rotation of the rotor and performs suction from the gap, and the negative pressure generating means forms the gap. An inclined flange portion extending from the outer peripheral surface of the rotor to a side surface of the rotor, wherein the outer peripheral surface of the inclined flange portion is formed in a tapered shape with an outer diameter gradually increasing on the side surface side of the rotor. The flange portion is formed at both end portions in the axial direction of the rotor, and the negative pressure generating means is connected to the inner peripheral surface of the stator at both end portions in the axial direction of the stator. And an inclined surface whose inner diameter gradually increases on the end side in the axial direction of the stator so as to face the outer peripheral surface of each inclined flange portion, and the maximum outer diameter of one inclined flange portion is The minimum inner diameter of one of the inclined surfaces that is equal to or smaller than the inner diameter of the inner peripheral surface of the stator and faces the one inclined flange portion is smaller than the maximum outer diameter of the one inclined flange portion, and the one At least one of the inclined surface and the inclined flange portion is formed by an elastic member.

According to the present invention, the lubricating oil is so caused to scatter radially outward of the rotor by centrifugal force, flows through the outer peripheral side of that forms the oil passage. The lubricating oil penetrates between the laminated steel sheets even when the rotor is constituted by laminated steel sheets by means of negative pressure generating means that performs suction from the gap between the rotor and the stator. And supply of the lubricating oil to the gap is suppressed. As a result, the amount of lubricating oil in the gap between the rotor and the stator is relatively small, so that power loss and heat generation due to stirring or dragging of the lubricating oil can be prevented or suppressed.

According to the invention of claim 2, since at least one of the one inclined surface and the inclined flange portion is formed by an elastic member, it can be easily bent by deformation of the elastic member that occurs during assembly. Assembly can be made possible.

It is sectional drawing of the cooling device of the motor which concerns on this invention. It is sectional drawing which shows an example of the end plate used with the cooling device of the motor which concerns on this invention. Other specific examples of the present invention are shown, in which (a) is an overall sectional view and (b) is an enlarged sectional view of a part thereof. Another specific example of this invention is shown, (a) is sectional drawing of the process in which a rotor is inserted in the inner peripheral side of a stator, (b) is sectional drawing of the state which insertion was completed.

  The present invention will be described based on a specific example shown in the drawings. The motor cooling device according to the present invention causes the lubricating oil to flow outward in the radial direction of the rotor due to the centrifugal force generated by the rotation of the rotor, and as a result, supplies the lubricating oil scattered or outflowed from the rotor to the stator. The rotor and the stator are configured to take heat from the lubricating oil and cool them. The rotor and the stator itself may have a conventionally known general configuration. In the example shown in FIG. 1, the rotor shaft 1 is rotatable by a casing 3 via bearings 2 arranged at both ends thereof. Has been. The rotor shaft 1 is a hollow shaft, and one end portion thereof is communicated with an oil passage 4 formed in the casing 3. The lubricating oil can be supplied to the one bearing 2 from the oil passage 4.

  A permanent magnet 6 is fitted in a location near the outer periphery of the rotor 5. A stator 7 is disposed on the outer peripheral side of the rotor 5. The stator 7 has an annular shape similar to the stator in the conventional permanent magnet synchronous motor, and is fixed to the casing 3. Although not shown in detail, the stator 7 includes a plurality of electromagnetic coils. A torque is generated in the rotor 5 by changing a magnetic field by changing a flowing current. Therefore, a gap 8, which is a slight gap, is formed between the outer peripheral surface of the rotor 5 and the stator 7.

  Since the rotor 5 is composed of laminated steel plates, the rotor 5 is attached to the rotor shaft 1 in a state of being tightened by applying a load in the axial direction so that the steel plates are in close contact with each other. More specifically, a lock portion 9 integral with the rotor shaft 1 is provided on at least one end side in the axial direction of the rotor 5 (both end portions in the example shown in FIG. 1). An end plate 10 is sandwiched between the rotor 5 and the rotor 5. The lock portion 9 is essentially a portion that is integral with the rotor shaft 1 and protrudes toward the outer periphery of the rotor shaft 1. In the example shown in FIG. 1, the caulking member having a flange portion protruding toward the outer periphery is used as the rotor shaft. It is formed by fitting to 1. Note that a lock nut 9 may be screwed into the rotor shaft 1 to form the lock portion 9.

  The end plate 10 is for applying a tightening force in the axial direction to the laminated steel plates constituting the rotor 5, and is also provided with a configuration or function for cooling. That is, an oil passage 11 is provided that allows the lubricating oil to flow from the inner peripheral side toward the outer peripheral side at the end of the rotor 5 in the axial direction. More specifically, each end plate 10 is formed in an annular shape as a whole so as to be fitted to the rotor shaft 1, and as shown in FIG. 2, the first side plate portion 12 having a relatively large outer diameter. The second side plate portion 13 having a relatively small outer diameter is connected to each other at the inner peripheral edge portion. In addition, the connection part of the inner periphery part is tentatively made the cylindrical part 14 hereafter. The cylindrical portion 14 is formed with a through hole 15 that opens to an inner peripheral surface and an outer peripheral surface. On the other hand, the rotor shaft 1 is formed with an oil hole 16 penetrating from the inner peripheral portion to the outer peripheral surface, and in a state where the end plate 10 is fitted and attached to a predetermined portion of the rotor shaft 1, The oil hole 16 of the rotor shaft 1 and the through hole 15 of the end plate 10 are configured to communicate with each other. That is, the portion between the side plate portions 12 and 13 is configured to communicate with the inner peripheral portion of the rotor shaft 1 through the through hole 15 and the oil hole 16. An intermediate portion is an oil passage 11.

  The first side plate portion 12 having a large outer diameter is a portion that is in close contact with the end surface in the axial direction of the rotor 5, and the outer peripheral portion of the first side plate portion 12 is a so-called soot ( Elongate. That is, the outer peripheral side portion of the first side plate portion 12 has a tapered shape in which the inner diameter gradually increases as the distance from the rotor 5 increases, and the tapered annular portion 17 covers the outer peripheral side of the opening end of the oil passage 11. Yes. Therefore, while the centrifugal oil pressure of the lubricating oil in the oil passage 11 acts outward in the radial direction, the tapered annular portion 17 that receives the centrifugal oil pressure is in a state of crossing obliquely with respect to the radial direction. When centrifugal hydraulic pressure acts on the tapered annular portion 17, the force is converted into an axial thrust, and the axial thrust presses the rotor 5 in the axial direction via the first side plate portion 12. As a result, the laminated steel plates constituting the rotor 5 are tightened in the axial direction and brought into close contact with each other.

  Further, each first side plate portion 12 is formed with a through hole 18 that opens on both the front and back surfaces (the surface in contact with the rotor 5 and the surface on the oil hole 16 side). The position of the through hole 18 is a position corresponding to the permanent magnet 6 described above, and therefore, a part of the lubricating oil flowing through the oil passage 11 is supplied to the permanent magnet 6.

  The side plate portions 12 and 13 and the cylindrical portion 14 connecting them are integrally formed of metal or synthetic material, and the side plate portions 12 and 13 are in a so-called free state where no external force is applied. The distance between the two is gradually increased on the outer peripheral side, and is elastically bent when receiving an external force acting in the axial direction, so that the distance between the two becomes relatively narrow. The end plate 10 is bent so that the distance between the side plate portions 12 and 13 is narrowed and is sandwiched between the rotor 5 and the lock portion 10 described above. Therefore, the reaction force accompanying such elastic deformation is an axial thrust on the rotor 5, and the end plate 10 also functions as a fastening member for the rotor 5. In order to increase the tightening force, an elastic member that applies an elastic force so as to widen the interval between the side plate portions 12 and 13 may be disposed between the side plate portions 12 and 13.

  At least one of the stators 7 in the axial direction (both in the example shown in FIG. 1) is a negative pressure generating portion that actively discharges lubricating oil from the gap 8 in cooperation with the tapered annular portion 17 described above. 20 is provided. The negative pressure generating portion 20 is a portion configured such that the negative pressure sucked from the gap 8 increases as the rotational speed of the rotor 5 increases. Specifically, both ends of the stator 7 in the axial direction are The part is formed with an inclined surface 21 facing the outer peripheral surface of the tapered annular part 17 substantially parallel to the gap 8 at the same interval. That is, the gap between the inclined surface 21 and the outer peripheral surface of the tapered annular portion 17 communicates with the gap 8 and is configured such that the radius gradually increases on the tip end side of the tapered annular portion 17. . Therefore, the centrifugal force caused by the rotation of the rotor 5 acts on the lubricating oil entering between the inclined surface 21 and the outer peripheral surface of the tapered annular portion 17, and the lubricating oil is on the end side in the axial direction of the rotor 5. Therefore, a negative pressure sucked to the end portion in the axial direction acts on the gap 8 communicating with the gap 8.

  By the way, when the motor having the above-described structure is assembled, the rotor 5 that has been assembled to the rotor shaft 1 is usually inserted into the inner peripheral side of the stator 7, whereas the cooling device according to the present invention is described above. In order to facilitate the assembly of the motor, the following structure is provided. First, when the rotor 5 is inserted into the inner peripheral side of the stator 7, the maximum outer diameter of the end plate 10 (the right end plate 10 in FIG. 1) provided at the end that becomes the front end side of the rotor 5 The outer diameter of the tip end portion of the tapered annular portion 17 is set to be equal to or smaller than the inner diameter of the stator 7. On the other hand, of the end portions in the axial direction of the stator 7, the end portion (the right end portion in FIG. 1) located on the front end side when the rotor 5 is assembled is tapered with the inclined surface 21 described above. A block 22 is attached. The tapered block 22 is an annular member whose inner peripheral surface is a tapered inclined surface 21, and the minimum inner diameter is the outer diameter of the rotor 5 and the outermost peripheral portion of the end plate 10 on the tip side. It is smaller than the outer diameter. The tapered block 22 is made of an elastic material such as rubber. Therefore, when the rotor 5 is inserted into the inner peripheral side of the stator 7, the end plate 10 on the front end side proceeds without contacting the inner peripheral surface of the stator 7 or lightly, but the taper on the front end side is increased. The block 22 is in contact with the portion on the small diameter side. However, the tapered block 22 is made of an elastic material and can be easily bent. Therefore, when the rotor 5 is further pushed, the tapered annular portion 17 on the tip end side bends the tapered block 22 and further proceeds. Then, it is assembled in the state shown in FIG. Since the elastically bent tapered block 22 returns to its original shape when the end plate 10 passes, there is a slight gap between the inner peripheral surface of the tapered block 22 and the outer peripheral surface of the tapered annular portion 17. The flow path of the lubricating oil that flows in the outer peripheral direction by centrifugal force is formed.

  Next, the cooling action by the cooling device described above will be described. Lubricating oil is supplied through the oil passage 4 formed in the casing 3, and therefore a part of the lubricating oil is supplied to the bearing 2 for lubrication, and other lubricating oil is used for the rotor shaft 1. Flows into the oil passage 11 of the end plate 10 through the oil hole 16. Then, the lubricating oil is supplied from the oil passage 11 through the through hole 18 formed in the first side plate portion 12 to the permanent magnet 6, and as a result, the permanent magnet 6 is directly cooled by the lubricating oil. Further, the lubricating oil penetrates between the laminated steel plates constituting the rotor 5, and the rotor 5 is cooled by the lubricating oil.

  When the rotor 5 rotates, centrifugal force acts on the lubricating oil in the oil passage 11 integrated therewith, so that the lubricating oil is positively caused to flow to the outer peripheral side, and centrifugal hydraulic pressure is generated. Since the end plate 10 is fixed to the rotor shaft 1 by the lock portion 9 described above, when the pressure is increased by the centrifugal hydraulic pressure in the oil passage 11, the rotor 5 is pressed in the axial direction via the first side plate portion 12, The laminated steel plates constituting the rotor 5 are strongly adhered to each other. Similarly, the lubricating oil flowing out from the oil passage 11 to the outer peripheral side pushes the tapered annular portion 17 covering the opening on the outer peripheral side of the oil passage 11, in which case the tapered annular portion 17 is As described above, since it is inclined with respect to the radial direction, thrust in the axial direction is generated according to the centrifugal hydraulic pressure, and the laminated steel plates constituting the rotor 5 are brought into strong contact with each other by the axial thrust. Thus, the amount of lubricating oil between the laminated steel plates is reduced by tightly adhering to each other, and the amount of lubricating oil entering the gap 8 between the outer peripheral surface of the rotor 5 and the inner peripheral surface of the stator 7 is reduced. be able to.

  Further, the lubricating oil is continuously supplied to the oil passage 11 in the end plate 10 so that the oil passage 11 is always filled with new lubricating oil. Therefore, since the heat can be taken from the rotor 5 by the lubricating oil, the rotor 5 can be cooled. Furthermore, since the lubricating oil scattered from the oil passage 11 to the outer peripheral side is supplied to the stator 7 located on the outer peripheral side of the rotor 5, the stator 7 is cooled by being deprived of heat by the lubricating oil.

  In addition, this invention is not limited to the specific example mentioned above, Comprising: The rotor 5 may be provided with the electromagnetic coil instead of the permanent magnet. Further, the rotor 5 does not have to be directly fitted to the outer peripheral surface of the rotor shaft 1. In short, the rotor 5 only needs to be configured to rotate integrally with the rotor shaft, and therefore the rotor 5 is lubricated. Since the oil supply only needs to be performed from the inner peripheral side of the rotor, the oil path may not be formed in the rotor shaft 1.

  Next, another embodiment of the present invention will be described based on a specific example shown in the drawings. Also in the embodiment described below, the lubricating oil is caused to flow outward in the radial direction of the rotor due to the centrifugal force caused by the rotation of the rotor, and as a result, the lubricating oil scattered or outflowed from the rotor is supplied to the stator. The lubricating oil removes heat from the rotor and the stator and cools them. The rotor and the stator itself may have a conventionally known general configuration, and in the example shown in FIG. 3, the rotor shaft 23 is freely rotatable by a casing 25 via bearings 24 arranged at both ends thereof. Has been. The rotor shaft 23 is a hollow shaft, and one end portion thereof is communicated with an oil passage 26 formed in the casing 25. Note that the lubricating oil can be supplied to the one bearing 24 from the oil passage 26.

  A stator 28 is disposed on the outer peripheral side of a rotor 27 that is integral with the rotor shaft 23. The stator 28 has an annular shape like the stator in the conventional permanent magnet type synchronous motor, and is fixed to the casing 25. Although not shown in detail, the stator 28 includes a plurality of electromagnetic coils. A torque is generated in the rotor 27 by changing the flowing current and changing the magnetic field. Therefore, a gap 29, which is a slight gap, is formed between the outer peripheral surface of the rotor 27 and the stator 28.

  Since the rotor 27 is composed of laminated steel plates, the rotor 27 is attached to the rotor shaft 23 in a state of being tightened by applying a load in the axial direction so that the steel plates are in close contact with each other. More specifically, a lock portion 30 integral with the rotor shaft 23 is provided on at least one end side in the axial direction of the rotor 27 (both end portions in the example shown in FIG. 3). An end plate 31 is sandwiched between the rotor 27 and the rotor 27. The lock portion 30 is, in essence, a portion that is integral with the rotor shaft 23 and protrudes toward the outer peripheral side of the rotor shaft 23. In the example shown in FIG. 3, a caulking member having a flange portion protruding toward the outer peripheral side is used as the rotor shaft. 23 is formed by fitting it to 23. Note that a lock nut 30 may be screwed into the rotor shaft 23 to form the lock portion 30.

  Each of the left and right end plates 31 is for applying a tightening force in the axial direction to the laminated steel plates constituting the rotor 27. Unlike the end plate 10 in the above-described specific example, each of the end plates 31 is an annular plate member. It is constituted by. A protruding portion 31 a for contacting the rotor 27 and pressing the rotor 27 in the axial direction is formed on the outer peripheral portion of the surface of each end plate 31 facing the rotor 27. The projecting portion 31 a is an annular portion, and therefore, a gap portion is formed between the end plate 31 and the rotor 27 on the inner peripheral side thereof. As in the example shown in FIG. 1 described above, an oil hole 36 is formed in the rotor shaft 23, and the oil hole 36 communicates with the gap portion. Therefore, a gap between the end plate 31 and the rotor 27 serves as an oil passage 31b. The oil passage 31b is formed on the inner peripheral side of the annular projecting portion 31a described above, and is closed by the projecting portion 31a to the outside in the radial direction of the rotor 27. Therefore, in order to supply lubricating oil from the oil passage 31b to the stator 28, a through hole 31c penetrating in the axial direction is formed in a portion on the outer peripheral side close to the protruding portion 31a in the side wall portion of each end plate 31. Has been.

  Further, at least one end (both in FIG. 3) in the axial direction of the stator 28 is formed with a tapered surface 32 whose inner diameter gradually increases as the distance from the rotor 27 increases. In addition, a negative pressure generator 34 that actively discharges lubricating oil from the gap 29 in cooperation with the tapered surface 32 is provided. The negative pressure generating portion 34 is a portion configured to increase the negative pressure sucked from the gap 29 as the number of rotations of the rotor 27 increases. Specifically, the negative pressure generating portion 34 is shown in FIG. As described above, the left end plate 31 is formed with an inclined surface 35 facing the outer peripheral surface of the tapered surface 32 substantially parallel to the gap 29 with the same interval. FIG. 3B is an enlarged view of a portion indicated by reference numeral B in FIG. That is, the gap between the inclined surface 35 and the outer peripheral surface of the tapered surface 32 communicates with the gap 29 and is configured such that the radius gradually increases on the tip end side of the tapered surface 32. Therefore, the centrifugal force generated by the rotation of the rotor 27 acts on the lubricating oil that has entered between the inclined surface 35 and the outer peripheral surface of the tapered surface 32, and the lubricating oil is moved toward the end of the rotor 27 in the axial direction. Since the fluid flows, a negative pressure sucked to the end in the axial direction acts on the gap 29 communicating therewith.

  In addition, the outer peripheral surface of the right end plate 31 in FIG. 3A is a cylindrical circumferential surface parallel to the axial direction, and the cylindrical inner surface facing the outer peripheral surface with a slight gap therebetween. A circumferential surface is formed on the stator 28. The gap communicates with the gap 29 and the tapered surface 32 of the stator 28 described above, so that the lubricating oil that flows outward in the radial direction by centrifugal force at the tapered surface 32 attracts the lubricating oil in the gap 29. It has become.

  Next, the cooling action by the cooling device described above will be described. Lubricating oil is supplied through the oil passage 26 formed in the casing 25. Therefore, a part of the lubricating oil is supplied to the bearing 24 for lubrication, and other lubricating oil is supplied to the rotor shaft 23. Flows into the oil passage 31b of each end plate 31 through the oil passage 36. The lubricating oil that has flowed into the oil passage 31b flows to the outside of the end plate 31 through the through-hole 31c. However, since it receives a centrifugal force, it flows radially outward along the end plate 31, As a result, it is supplied to the inner peripheral portion of the stator 28. Since the lubricating oil is continuously supplied to the stator 28 in this way, the stator 28 is cooled by being deprived of heat by the lubricating oil.

  Since the stator 27 is stopped and the rotor 27 is continuously rotated, the lubricating oil is continuously applied from each end plate 31 to the both end portions in the axial direction of the stator 28 as described above. The supplied lubricating oil flows along the tapered surface 32 formed in the stator 28 toward the larger diameter side. Since the lubricating oil flowing through the tapered surface 32 is in a state in which both ends of the gap 29 are closed, by flowing along the tapered surface 32 in a direction away from the gap 29, the gap 29 A negative pressure is applied to the end portion in the axial direction.

  Further, the lubricating oil is continuously supplied to the oil passage 31b and the through hole 31c in the end plate 31, whereby the oil passage 31b and the through hole 31c are always filled with new lubricating oil. Therefore, since the heat can be taken from the rotor 27 by the lubricating oil, the rotor 27 can be cooled.

  In the example shown in FIG. 3 described above, the outer peripheral surface of the right end plate 31 in FIG. 3 is formed in a cylindrical shape, and its outer diameter is set to be equal to or smaller than the minimum inner diameter of the stator 28. This is to prevent the rotor 27 from interfering with the stator 28 when the rotor 27 is inserted into the inner peripheral side of the stator 28. On the other hand, the flow of the lubricating oil on the tapered surface 32 that sucks the lubricating oil from the gap 29 flows in a so-called released flow path, and the suction action may not necessarily be sufficiently high. Therefore, the configuration of the right side in the drawing, that is, the so-called tip side portion when the rotor 27 is inserted into the stator 28 may be the same as the configuration shown in FIG. An example is shown in FIGS. 4A and 4B.

  In the example shown here, the outer peripheral surface 35R of the right end plate 31R in the drawing is formed in a tapered shape that gradually increases in diameter as it moves away from the rotor 27, and its maximum outer diameter is equal to or smaller than the inner diameter of the stator 28. ing. Further, a tapered block 22R having the same shape as the tapered block 22 shown in FIG. 1 is attached to the inner peripheral portion on the right side of the stator 28, and a tapered inclined surface 21R that is an inner peripheral surface thereof is provided. It faces the outer peripheral surface 35R of the end plate 31R with a slight gap. This gap communicates with the gap 29 described above. Further, the minimum inner diameter of the tapered block 22R is smaller than the maximum outer diameter of the end plate 31R, and the tapered block 22R can be elastically bent when it interferes with the end plate 31R. It is made of an elastic material such as rubber. Since the other configuration is the same as the example shown in FIG. 3, the same reference numerals as those in FIG. 3 are given to (a) and (b) in FIG.

  Therefore, even in the configuration shown in FIG. 4, when the rotor 27 is inserted into the inner peripheral side of the stator 28, the end plate 31 </ b> R on the tip side does not contact the inner peripheral surface of the stator 28 or lightly contacts it. However, as shown in FIG. 4A, the tip-side tapered block 22R comes into contact with the small-diameter side portion. However, the tapered block 22R is made of an elastic material and can be easily bent. Therefore, when the rotor 27 is further pushed in, the large-diameter portion on the tip side further bends the tapered block 22R and proceeds further. 4 is assembled in the state shown in FIG. The tapered block 22R which is elastically bent returns to its original shape when the end plate 31R passes, so that a slight gap is left between the inclined surface 21R of the tapered block 22R and the outer peripheral surface 35R of the end plate 31R. The flow path of the lubricating oil that flows in the outer peripheral direction by centrifugal force is formed. As described above, in the configuration shown in FIG. 4, the attractiveness from the gap 29 can be improved without hindering the assembling property.

  DESCRIPTION OF SYMBOLS 1 ... Rotor shaft, 2 ... Bearing, 3 ... Casing, 4 ... Oil path, 5 ... Rotor, 6 ... Permanent magnet, 7 ... Stator, 8 ... Gap, 9 ... Lock part, 10 ... End plate, 11 ... Oil path, DESCRIPTION OF SYMBOLS 12 ... 1st side board part, 13 ... 2nd side board part, 14 ... Cylindrical part, 15 ... Through-hole, 16 ... Oil hole, 17 ... Tapered annular part, 18 ... Through-hole, 20 ... Negative pressure generation part, 21 and 21R ... Inclined surface, 22, 22R ... Tapered block, 23 ... Rotor shaft, 24 ... Bearing, 25 ... Casing, 26 ... Oil passage, 27 ... Rotor, 28 ... Stator, 29 ... Gap, 30 ... Lock part, 31 ... End Plate, 31a ... Projection, 31b ... Oil passage, 31c ... Through hole, 31R ... End plate, 32 ... Tapered surface, 34 ... Negative pressure generating part, 35 ... Inclined surface, 35R ... Outer surface, 36: Oil hole.

Claims (2)

In the motor cooling device in which the stator is concentrically arranged with a slight gap on the outer peripheral side of the rotor, and the rotor is cooled by oil,
At least one end in the axial direction of the rotor, communicates with the said gap, said rotor negative pressure generating means for negative pressure is generated to suck from the gap provided we are by rotating,
The negative pressure generating means is an inclined flange portion extending from an outer peripheral surface of the rotor forming the gap to a side surface of the rotor, and the outer peripheral surface of the inclined flange portion gradually increases on the side surface side of the rotor. It is formed in a tapered shape with an increasing outer diameter,
An oil passage is formed between the outer peripheral surface of the inclined flange portion and the inner peripheral surface of the stator facing each other with a slight gap, and the oil passage communicates with the gap. apparatus. In the motor cooling device in which the stator is concentrically arranged with a slight gap on the outer peripheral side of the rotor, and the rotor is cooled by oil,
At least one end portion in the axial direction of the rotor is provided with negative pressure generating means that communicates with the gap and generates a negative pressure by the rotation of the rotor and performs suction from the gap.
The negative pressure generating means is an inclined flange portion extending from an outer peripheral surface of the rotor forming the gap to a side surface of the rotor, and the outer peripheral surface of the inclined flange portion gradually increases on the side surface side of the rotor. It is formed in a tapered shape with an increasing outer diameter,
The inclined flange portions are formed at both ends in the axial direction of the rotor, and
The negative pressure generating means is formed on both ends of the stator in the axial direction so as to be continuous with the inner peripheral surface of the stator, and in the axial direction of the stator so as to face the outer peripheral surface of each inclined flange portion. Including an inclined surface whose inner diameter gradually increases on the end side,
The maximum outer diameter of one inclined flange portion is equal to or less than the inner diameter of the inner peripheral surface of the stator, and the minimum inner diameter of one inclined surface facing the one inclined flange portion is the maximum outer diameter of the one inclined flange portion. Smaller than the diameter, and
At least one of the one inclined surface and the inclined flange portion is formed of an elastic member.
Motors of the cooling device, characterized in that.

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