JP2007166802A - Rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the rotational resistance of a rotor generated by the agitation of lubricant oil by forming a flow of the oil in a motor chamber when the rotor rotates. <P>SOLUTION: Salient poles 80 have resistance surfaces 90 receiving resistance generated by the abutment of the lubricant oil (oil surface is shown by a dashed line D) reserved in the motor chamber when it rotates in a direction Rm in which the rotor 18 mainly rotates. A shaft flow forming surface 90c inclined in the shaft direction is formed so that a flow outward in the shaft direction is formed on the lubricant oil abutting on the end of the shaft direction of the resistance surface 90, and on the end of the shaft direction of the rotating shaft 12 thereof. The shaft flow forming surface 90c of the salient pole 80 forms an outward flow in the shaft direction on the lubricant oil abutting on the surface 90c, thereby urging the discharge of the lubricant oil from a slot opening 86. In this way, the rotational resistance applied to the rotor 18 can be reduced when the rotor rotates. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine having a rotor in which salient poles protruding in a radial direction of a rotating shaft are arranged in a circumferential direction.

  Some rotating electrical machines such as electric motors have salient poles that protrude in the radial direction of the rotating shaft arranged at predetermined intervals in the circumferential direction. A reluctance motor is known as a rotating electric machine having salient poles on such a rotor. By arranging the salient poles in the circumferential direction, reluctance, that is, portions with low and high magnetic resistance are alternately arranged in the rotor circumferential direction. When a rotating magnetic field is formed around the rotor by the stator, the salient poles are attracted to the rotating magnetic field, and torque for rotating the rotor can be generated.

  The reluctance motor is a motor that does not have a permanent magnet disposed on the rotor and generates torque due to the difference in reluctance as described above. Since no permanent magnet is used in the rotor, the cost is reduced accordingly, and a structure for fixing the permanent magnet to the rotor is unnecessary, and the structure can be simplified. Furthermore, it is not necessary to consider that the permanent magnet is peeled off from the rotor by the centrifugal force due to rotation, and it is suitable for use at high speed rotation. From such advantages, the reluctance motor is considered to be promising as a power source for automobiles, for example.

  By the way, in the rotating electric machine as described above, in order to lubricate the bearing that supports the rotating shaft of the rotor and to cool the rotor and the stator, lubricating oil is supplied to these parts from the outside, and the rotor and the stator are accommodated. There are those that operate in “the state in which the lubricating oil exists” such as the state in which the lubricating oil is accumulated or the lubricating oil is flowing in the bottom of the housing (hereinafter referred to as the motor chamber) (for example, (See Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 5-284691 JP 2005-106266 A

  When a rotating electrical machine that employs such a lubrication system has a rotor with the above-described salient poles, when lubricating oil flows into a groove-like gap (hereinafter referred to as a slot) between adjacent salient poles, The salient pole strikes this lubricating oil, which becomes the rotational resistance of the rotor. In the case of a rotating electric machine having a salient pole on such a rotor, the rotational resistance of the rotor due to the stirring of the lubricating oil (hereinafter referred to as “stirring resistance of the lubricating oil”) is such that the rotor has a substantially cylindrical shape. As a result, the torque output from the rotating electrical machine is reduced.

  In particular, when the rotating electrical machine is integrally coupled with a power transmission mechanism that transmits the power to constitute a vehicle drive device, the lubricating oil of the rotating electrical machine may be shared by the drive device, When the drive device is in the non-operating state, the salient pole may be immersed in the lubricating oil accumulated in the motor chamber. When the rotating electrical machine in such a state is operated, the salient poles agitate the lubricating oil, and a very large agitation resistance of the lubricating oil acts on the rotor, which causes a deterioration in fuel consumption of the vehicle. As described above, a rotating electrical machine having a rotor with salient poles is required to have a technique for reducing the agitation resistance of lubricating oil.

  Therefore, the present invention provides a rotating electrical machine that can reduce the stirring resistance of lubricating oil by forming a flow in the oil in the motor chamber when the rotor rotates.

  In the rotating electrical machine of the present invention, the salient pole has a resistance surface that receives resistance due to the contact of the lubricating oil by rotation of the rotor, and the end of the resistance surface in the axial direction of the rotating shaft is exposed to the corresponding lubricating oil. An axial flow forming surface that is inclined with respect to the axial direction is formed so as to form an axially outward flow. The axial flow forming surface of the salient poles forms a flow outward in the axial direction in the lubricating oil hitting the salient poles, thereby facilitating the discharge of the lubricating oil from between adjacent salient poles.

  Preferably, the magnetic pole of the stator of the rotating electrical machine extends along the axial direction, and the salient pole extends at the approximate center in the axial direction along the axial direction, and the main body portion Further, it has an axial flow forming portion that extends on the outer side in the axial direction so as to be inclined with respect to the axial direction and whose resistance surface becomes an axial flow forming surface. A main body portion is provided corresponding to the magnetic pole of the stator extending along the axial direction, and an inclined axial flow forming portion is provided outside the main body portion. As the stator, a magnetic pole whose type extends along the conventional axial direction can be used, and a rotating electrical machine that forms an axially outward flow in the lubricating oil can be realized at low cost.

  Preferably, the rotating electrical machine defines a main rotation direction in which the rotor mainly rotates, and the axial flow forming portion moves backward from the main body portion toward the rotor end surface with respect to the main rotation direction. The inclination angle is set so that.

  Preferably, the motor chamber contains a rotor and has lubricating oil stored at the bottom, and has an oil passage that is provided on the outer side in the axial direction from the end surface of the rotor and communicates with the outside of the motor chamber. Then, the axial flow forming part forms a flow toward the oil passage, whereby the lubricating oil accumulated in the motor chamber is discharged out of the motor chamber.

  Preferably, the rotating electrical machine is integrally coupled with a power transmission mechanism having a gear for transmitting power from the rotating electrical machine, and constitutes a drive device that drives the vehicle. A gear chamber for housing the gear and a tank chamber for storing lubricating oil supplied to the motor chamber and the gear chamber are provided. When the rotor rotates, the lubricating oil collected in the motor chamber is sent from the oil passage to the gear chamber, and further swept up into the tank chamber by the gear, so that the amount of oil that is stored in the tank chamber and hits the resistance surface of the rotor is reduced. Decrease.

  According to the rotating electrical machine of the present invention, the axially outward flow is formed in the lubricating oil in the slot, and the lubricating oil is discharged out of the slot, so that the stirring resistance of the lubricating oil during rotor rotation is reduced. Can do.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. As an example, a rotating electrical machine integrally coupled to a vehicle drive device will be described.

  First, the drive device 5 of the vehicle 1 to which the rotating electrical machine 10 of this embodiment is applied and its control system will be described with reference to FIG. FIG. 1 shows a schematic configuration of the drive device 5 and the control system of the vehicle 1. The vehicle 1 is provided with a rotating electrical machine 10 that is an electric motor capable of generating power as a power source. Further, as a mechanism for transmitting the power output from the rotating electrical machine 10 to the drive wheels 48, the speed reducer 30 that decelerates the rotation transmitted from the rotating electrical machine 10 to increase the torque, and the power transmitted from the speed reducer 30 is changed to the left and right. A differential device 40 that distributes to the driving wheels 48 is provided. The vehicle 1 also has a secondary battery 50 for storing power to be supplied to the rotating electrical machine 10, an inverter 52 that is interposed between the secondary battery 50 and the rotating electrical machine 10, and controls the inverter 52. Thus, an electronic control unit 54 (hereinafter referred to as ECU) that controls the driving of the rotating electrical machine 10 is provided.

  The rotating electrical machine 10 converts the electric power supplied from the inverter 52 into motive power and outputs it from the rotating shaft 12, and converts the electric power input from the rotating shaft 12 into electric power and outputs it to the inverter 52. The function as a generator to perform is combined, and these functions as a motor or a generator are controlled by the ECU 54 so as to be sequentially switchable. The rotating electrical machine 10 can output power to the drive wheels 48 as an electric motor, and can convert and recover the power transmitted from the drive wheels 48 as electric power as a generator.

  The rotating electrical machine 10 includes a stator 16 and a rotor 18. The stator 16 is electrically connected to the inverter 52 and can receive a power supply from the inverter 52 to form a rotating magnetic field. The rotor 18 is driven to rotate by being attracted to a rotating magnetic field formed in the stator 16. A rotating shaft 12 is coupled to the rotor 18, and the rotational driving force generated in the rotor 18 is transmitted from the rotating shaft 12 to the speed reduction device 30. The structure of the rotor 18 of the rotating electrical machine 10 and the salient poles arranged thereon will be described later.

  The reduction gear 30 includes a main shaft 32 connected to the rotary shaft 12 of the rotating electrical machine 10, a counter drive gear 33 coupled to the main shaft 32, a counter driven gear 34 that meshes with the counter drive gear 33, and a counter driven The counter shaft 35 is connected to the gear 34, and the final drive gear 36 is connected to the counter shaft 35 and meshes with the ring gear 42 of the differential device 40.

  The rotation transmitted from the rotating shaft 12 of the rotating electrical machine 10 to the main shaft 32 is transmitted to the countershaft 35 with the rotational speed reduced and the torque increased by the counter drive gear 33 and the counter driven gear 34. The rotation transmitted to the countershaft 35 is further transmitted to the differential device 40 by the final drive gear 36 and the ring gear 42 of the differential device 40 where the rotational speed is further reduced and the torque is increased. In this way, the speed reduction device 30 decelerates the rotation output from the rotating shaft 12 of the rotating electrical machine 10 and increases the torque, and transmits the power output from the rotating electrical machine 10 to the differential device 40.

  The differential device 40 includes a ring gear 42 that meshes with the final drive gear 36, and a differential case 43 that is fixed to the ring gear 42. The differential case 43 rotatably holds left and right side gears 45 respectively connected to the left and right drive shafts 46 and a pinion gear 44 that meshes perpendicularly to the side gears 45.

  The rotation transmitted from the final drive gear 36 of the reduction gear 30 to the differential case 43 via the ring gear 42 is transmitted from the pinion gear 44 that rotates together with the differential case 43 to the side gear 45. The rotation of the side gear 45 is transmitted to the drive wheels 48 via the left and right drive shafts 46. When a difference in rotational speed occurs between the left and right drive wheels 48, such as when the vehicle 1 turns, a rotational speed difference also occurs in the side gear 45. In this case, the pinion gear 44 rotates, This rotational speed difference can be absorbed. In this way, the differential device 40 can distribute and transmit the power output from the reduction gear 30 to the left and right drive shafts 46, that is, the drive wheels 48.

  By configuring the vehicle 1 as described above, the rotating electrical machine 10 transmits the power generated from the power supplied from the secondary battery 50 to the drive wheels 48 via the speed reducer 30 and the differential device 40. Thus, the vehicle 1 can be propelled. Further, when the vehicle is decelerated, the power input from the drive wheels 48 to the differential device 40 and the speed reducer 30 is transmitted to the rotating electrical machine 10 where it is converted into electric power and collected in the secondary battery 50. Is possible. The power generation and power recovery of the rotating electrical machine 10 are appropriately controlled by the ECU 54 according to the required driving force calculated based on the operation amount of the accelerator position sensor 56 and the remaining battery capacity detected from the secondary battery 50. Yes.

  The rotating electrical machine 10, the speed reduction device 30, and the differential device 40 described above constitute a drive device 5 that is integrally coupled. In this drive device 5, the lubricating oil that lubricates the rotating electrical machine 10, the speed reduction device 30, and the differential device 40 is shared, and the lubricating oil circulates in the drive device 5, and sequentially turns these devices. It is configured to lubricate and cool. Below, the structure of the drive device 5 and the flow of lubricating oil circulating in the drive device 5 will be described with reference to FIGS. 2 shows a cross-sectional view of the rotating electrical machine 10 and the drive device 5, and FIG. 3 shows a cross-sectional view taken along line AA of FIG. 2, that is, a vertical cross-sectional view of the drive device. In these drawings, the arrow X indicates the left side of the vehicle, the arrow Y indicates the front of the vehicle, and the arrow Z indicates the upper side of the vehicle.

  As shown in FIG. 2, the driving device 5 includes a motor chamber 10 a that houses the rotor 18, the stator 16, and the rotating shaft 12, and gears 33, 34, and 36 of the speed reduction device 30 and shafts 32 and 35. A gear chamber 30 a that houses the ring gear 42 and the differential case 43 of the device 40 and a tank chamber 60 a that stores lubricating oil in the driving device 5 are formed. As shown in FIG. 3, an upper tank chamber 62 a that communicates with the tank chamber 60 a and temporarily stores lubricating oil when the driving device 5 is operated is formed above the stator 16 of the rotating electrical machine 10. Yes. The motor chamber 10a, the gear chamber 30a, the tank chamber 60a, and the upper tank chamber 62a are partitioned by the housing 14 of the driving device 5. As shown in FIG. 2, an oil passage 64 is formed between the tank chamber 60a and the gear chamber 30a.

  Further, as shown in FIG. 3, the housing 14b between the motor chamber 10a and the gear chamber 30a is formed with an oil passage 66 that communicates these, and the oil passage 66 is formed from the rotor end face 18b. The rotary shaft 12 is provided on the outer side in the axial direction (indicated by the arrow T). A communication hole 68 is formed between the motor chamber 10a and the upper tank chamber 62a. As described above, the motor chamber 10a, the gear chamber 30a, the tank chamber 60a, and the upper tank chamber 62a are in communication with each other so that lubricating oil can flow. Further, the main shaft 32 and the counter shaft 35 of the speed reducer 30 and the rotating shaft 12 of the rotating electrical machine 10 are formed hollow inside, and both ends of the hollow portion are open. That is, the lubricating oil can flow from one end to the other end of the shaft and the rotating shaft 12.

  Next, the flow of the lubricating oil that circulates in the driving device 5 will be described. When the vehicle 1 is stationary, that is, when the driving device 5 and the rotating electrical machine 10 are in an inoperative state, a predetermined amount of lubricating oil is accumulated in the bottom portions 10c and 30c of the motor chamber 10a and the gear chamber 30a. The height of the oil level is substantially the same. At this time, the rotor 18 of the rotating electrical machine 10 is immersed in the lubricating oil.

  Then, when the drive device 5, that is, the rotating electrical machine 10 rotates the rotor 18 to advance the vehicle 1, the ring gear 42 rotates with the rotation of the rotor 18, and the lubricating oil in the gear chamber 30a is transferred to the upper tank 62a. Raise it. The lubricating oil that has been lifted up by the upper tank 62a drops from the communication hole 68 to cool the stator 16, and flows into the tank chamber 60a from a lubricating oil passage (not shown). The lubricating oil that has flowed into the tank chamber 60a flows from the oil passage 64 into the gear chamber 30a.

  The lubricating oil that has flowed into the gear chamber 30a lubricates the bearings 71 to 74 that hold the main shaft 32 and the counter shaft 35 in the gear chamber 30a, while the end of the main shaft 32 (see arrow H in FIG. It flows into the hollow portion of the main shaft 32 from the right side of the vehicle 1. The lubricating oil that has flowed from this hollow portion to the hollow portion 12a of the rotating shaft 12 as indicated by the arrow I lubricates the bearings 76 and 77 that hold the rotating shaft 12 as indicated by the arrow J and enters the motor chamber 10a. Inflow.

  Further, as shown in FIG. 3, the lubricating oil flowing into the motor chamber 10a flows through the lubricating oil passage 65 formed between the stator 16 and the housing 14 or between the stator 16 and the rotor 18, and further, the motor chamber 10a. As shown by an arrow K, an oil passage 64 between the gear chamber 30a and the gear chamber 30a flows outward in the axial direction T and returns to the gear chamber 30a again.

  The lubricating oil flowing from the motor chamber 10a to the gear chamber 30a and the lubricating oil flowing from the tank chamber 60a to the gear chamber 30a after lubricating the bearings 71 to 74 are merged, and as shown by an arrow L in FIG. It flows toward the device 40. The lubricating oil that has flowed into the differential device 40 lubricates the bearings 78 and 79 that hold the differential case 43 and the side gear 45 and the pinion gear 44 in the differential case 43, while the ring gear 42 rotates again. The raft is lifted up into the upper tank chamber 62a.

  As described above, the rotation of the ring gear 42 accompanying the rotation of the rotor 18 causes the lubricating oil to circulate in the driving device 5, thereby cooling the stator 16 with the lubricating oil supplied from the upper tank chamber 62a, while the motor chamber 10a. In addition, lubricating oil is supplied to the gear chamber 30a to lubricate the bearings. Further, the ring gear 42 lifts the lubricating oil in the gear chamber 30a and stores the lubricating oil in the tank chambers 60a and 62a, so that the gear chamber 30a and the motor chamber 10a communicating with the gear chamber 30a are collected. The oil level of the lubricating oil is lowered, and the amount of lubricating oil stirred by the salient poles 80 of the rotor 18 is reduced.

  Next, the structure of the rotor 18 of the rotating electrical machine 10 will be described with reference to FIGS. 3 and 4. 4 shows a cross-sectional view taken along the line BB in FIG. 3, that is, a cross-sectional view at the approximate center of the rotor 18. In FIG. 4, an example of the oil level of the lubricating oil accumulated in the motor chamber 10 a when the rotating electrical machine 10 is in an inoperative state is indicated by a one-dot chain line D.

  The rotating electrical machine 10 is a reluctance motor, and as shown in FIG. 4, the rotor 18 has salient poles 80 projecting outward in the radial direction of the rotating shaft 12 (indicated by the arrow S). (Denoted by R) at a predetermined interval. That is, a groove-like air gap 82 is formed between adjacent salient poles 80, and hereinafter, this “groove-like air gap” will be referred to as a slot 82.

  As shown in FIG. 3, the salient pole 80 is provided from the rotor end surface 18a to the other rotor end surface 18b. Specifically, a substantially central portion 80a between the two rotor end faces 18a and 18b (hereinafter referred to as a main body portion) extends along the axial direction (shown by an arrow T) of the rotation shaft. Corresponding to the main body portion 80a, the magnetic pole 16a of the stator 16 is provided along the axial direction T. Note that the portion 80c on the axially outer side from the main body portion 80a is inclined and extended with respect to the axial direction T, and details of this portion will be described later.

  When the rotor 18 having such a salient pole 80 is rotated, the salient pole 80 hits the lubricating oil accumulated in the motor chamber 10a, agitates it, and receives resistance as a reaction force from the lubricating oil. That is, among the surfaces constituting the salient poles 80, there is a surface that receives the resistance by the lubricating oil accumulated in the motor chamber 10a. This surface is determined according to the direction in which the rotor rotates.

  The rotating electrical machine 10 of the present embodiment constitutes the drive device 5 for the vehicle 1, and since the vehicle 1 is an automobile that can move forward and backward, the direction in which the rotor 18 mainly rotates (hereinafter referred to as the following). The main rotating direction) is defined as a direction in which the rotating electrical machine 10, that is, the driving device 5 advances the vehicle 1. The main rotation direction of the rotor 18 of the present embodiment is shown by arrows Rm in FIGS.

  From the above, for each salient pole 80 of the rotor of the present embodiment, the surface constituting the surface is defined as a surface that is subjected to resistance by the contact with the lubricating oil when the rotor 18 rotates in the main rotation direction Rm. Can do. In the following description, a surface that receives this resistance is referred to as a “resistance surface”, and is denoted by reference numeral 90 (90a, 90c) in FIGS. That is, as shown in FIG. 4, the resistance surface 90 becomes a boundary surface on the main rotation direction Rm side among the boundary surfaces between the salient poles 80 and the slots 82.

  In the rotating electrical machine 10 that employs the above-described lubrication system and has the salient pole 80, when the lubricating oil flows into the slot 82 from the motor chamber 10a, the resistance surface 90 of the salient pole 80 strikes this lubricating oil, which is the rotor. The torque output by the rotating electrical machine 10 is reduced by the 18 rotational resistance.

  In addition, when the rotary electric machine 10, that is, the driving device 5 is in an inoperative state, lubricating oil is accumulated at the bottom of the motor chamber 10 a, and the lubricating oil contains salient poles of the rotor 18 as shown in FIG. 4. 80 is soaked. When the rotating electrical machine 10 starts operating and the rotor 18 rotates in the main rotation direction Rm, the lubricating oil accumulated on the resistance surface 90 of the salient pole 80 is agitated, and a very large agitation resistance of the lubricating oil acts on the rotor 18. To do. At this time, the ring gear 42 rotates together with the rotor 18 to scoop up the lubricating oil, and the lubricating oil is stored in the tank chambers 60a and 62a, so that the amount of lubricating oil agitated by the salient poles 80 of the rotor 18 decreases. To go. However, until the rotation of the ring gear 42 causes the lubricating oil to be sufficiently stored in the tank chambers 60a and 62a and the oil level of the lubricating oil stored in the bottom 10c of the motor chamber 10a to decrease, It takes some time from the start of operation. During this time, since the salient pole 80 is immersed in the lubricating oil, a very large rotational resistance acts on the rotor 18.

  In order to reduce the agitation resistance of the lubricating oil during the rotation of the rotor as described above, in the present embodiment, the axial direction of the rotary shaft 12 is applied to the lubricating oil that strikes the resistance surface 90 of the salient pole 80 during the rotation of the rotor 18. An outward flow is formed. Below, the detailed structure of the salient pole 80 in this embodiment is demonstrated using FIGS. 5 shows an end view of the rotor as seen from the direction indicated by arrow C in FIG. 3, and FIG. 6 shows a top view of the salient pole as seen from the outside in the radial direction S indicated by arrow U in FIG. . FIG. 6 shows a state in which a cylindrical rotor is expanded in a plane for easy understanding.

  As shown in FIG. 3, the salient pole 80 includes a main body portion 80 a provided substantially at the center in the axial direction T, and an axial flow forming portion 80 c extending outward from the main body portion 80 a in the axial direction T. ing. The axial flow forming portion 80c is continuously extended from the main body portion 80a to the rotor end surfaces 18a and 18b. The main body portion 80a and the axial flow forming portion 80c have substantially the same axis orthogonal cross section surrounded by a two-dot chain line E in FIG.

  As shown in FIG. 6, the main body portion 80 a extends along the axial direction T of the rotor rotation shaft 12. Corresponding to the main body portion 80a, the magnetic pole 16a of the stator 16 is provided along the axial direction T. When the stator 16 forms a rotating magnetic field, the path between the magnetic pole 16a of the stator 16 and the main body 80a of the salient pole 80 becomes a path for magnetic flux. On the other hand, the axial flow forming portion 80c is inclined and extended with respect to the axial direction T at a predetermined angle θ. The inclination angle θ is set so as to recede from the main body portion 80a toward the end surface 18a of the rotor with respect to the main rotation direction Rm.

  By configuring the salient poles 80 in this way, the resistance surface 90 defined by the rotation of the rotor 18 has a main body surface 90a that is a boundary surface between the main body portion 80a and the slot 82, as shown in FIG. It is divided into an axial flow forming surface 90c which is a boundary surface between the flow forming portion 80c and the slot 82. That is, the end portion in the axial direction T corresponding to the axial flow forming portion 80c in the resistance surface 90 becomes the axial flow forming surface 90c. As described above, the axial flow forming surface 90c moves away from the main body surface 90a in the axial direction T of the rotary shaft 12 so that the axial flow forming surface 90c moves away from the main body surface 90a in the direction opposite to the main rotation direction Rm. On the other hand, it is inclined at an angle θ. As shown in FIG. 5, when the rotor end surface 18 a is viewed from the axial direction T, the axial flow forming surface 90 c looks through the slot opening 86.

  Note that the inclination angle θ of the axial flow forming surface is such that the rotating electrical machine 10 starts operating from a non-operating state and the lubricating oil accumulated in the motor chamber 10a needs to be discharged, or the rotating electrical machine. 10 can be set to an arbitrary angle according to the purpose of forming an axially outward flow in the lubricating oil, such as a rotational speed range frequently used.

  When the rotor 18 rotates in the main rotation direction Rm, that is, in FIG. 6, the salient pole 80 “moves” in the main rotation direction Rm, the lubricating oil in the slot 82 has a resistance surface 90 as indicated by the arrow F. It will move relatively toward. Of the lubricating oil that moves toward the resistance surface 90, the lubricating oil that has hit the axial flow forming surface 90 c changes its direction and moves outward in the axial direction T as indicated by an arrow G. That is, when the rotor 18 rotates in the main rotation direction Rm, the axial flow forming surface 90c forms an axially outward flow in the lubricating oil hitting this.

  Further, as the rotor 18 rotates, the axial flow forming surface 90c forms an axially outward flow (indicated by an arrow G) in the lubricating oil, so that the bottom 10c of the motor chamber 10a is formed in the motor chamber 10a as shown in FIG. The accumulated lubricating oil is pressed against the housing 14b between the motor chamber 10a and the gear chamber 30a. As a result, the lubricating oil in the motor chamber 10a is pumped from the oil passage 66 to the gear chamber 30a and discharged as indicated by an arrow K.

  The lubricating oil sent to the gear chamber 30a is further lifted up by the ring gear 42 and stored in the tank chambers 60a and 62a. Since the amount of lubricating oil stored in the tank chambers 60a and 62a increases as compared with when the rotating electrical machine 10 is in the non-operating state, the amount of lubricating oil accumulated in the motor chamber 10a and the gear chamber 30a is reduced by this amount. The oil level of the motor chamber 10a is lowered. As a result, the amount of lubricating oil hitting the resistance surface 90 of the salient pole 80 of the rotor 18 is reduced.

  As described above, in the present embodiment, the rotor 18 rotates in the main rotation direction Rm by forming the axial flow forming surface 90c at the end in the axial direction T of the resistance surface 90 of the salient pole 80. When the engine is in the slot 82, the axially outward flow is formed in the lubricant in the slot 82, thereby facilitating the discharge of the lubricant from the slot opening 86. As a result, it is possible to reduce the agitation resistance of the lubricating oil during the rotation of the rotor as compared with a rotating electrical machine having a conventional salient pole in the rotor.

  Further, in the present embodiment, the magnetic pole 16a of the stator 16 extends along the axial direction T, and a main body portion 80a that extends along the axial direction T is provided correspondingly. It is only necessary to provide an axial flow forming portion 80c inclined with respect to the main body portion 80a outside the main body portion 80a. The stator 16 has a type in which the magnetic pole 16a extends along the conventional axial direction T. Can be used. A rotating electrical machine that forms an axially outward flow in the lubricating oil can be realized at low cost.

  In the present embodiment, an oil passage 66 that communicates between the motor chamber 10a and the gear chamber 30a is provided on the axially outer side from the rotor end surface. When the rotor 18 starts to rotate, the lubricant accumulated in the bottom of the motor chamber is discharged from the oil passage to the gear chamber by the axially outward flow formed on the lubricant by the axial flow forming surface. In the non-operating state of the rotating electrical machine, the lubricating oil accumulated at the bottom of the motor chamber can be discharged out of the motor chamber simultaneously with the start of rotation of the rotor. Thereby, the oil level of the lubricating oil collected in the motor chamber can be lowered, and the amount of lubricating oil hitting the resistance surface of the rotor can be reduced.

  In the present embodiment, the axial flow forming portion 80c of the salient pole 80 has substantially the same cross section as the main body portion 80a, and is inclined with respect to the main body portion 80a. It is not limited to. It is only necessary to have an axial flow forming surface that forms an axially outward flow in the lubricating oil that hits the rotor when the rotor rotates. For example, the salient pole has a trapezoidal shape having an upper base on the main rotational direction Rm side. It is also suitable. It is only necessary to chamfer the two sides on the main rotation direction Rm side with respect to the salient pole exhibiting a substantially rectangular parallelepiped, and it can be easily manufactured.

1 is a diagram illustrating a schematic configuration of a vehicle to which a rotating electrical machine according to a first embodiment is applied. It is a cross-sectional view of the drive device with which the rotary electric machine of 1st Embodiment is couple | bonded integrally. It is a longitudinal cross-sectional view of the rotary electric machine of 1st Embodiment, and is sectional drawing by the AA line of FIG. It is sectional drawing of the rotor by the BB line of FIG. FIG. 4 is an end view of the rotor as seen from the direction indicated by arrow C in FIG. 3. FIG. 6 is a top view of salient poles as viewed from the direction indicated by arrow U in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Vehicle, 5 Drive apparatus, 10 Rotating electrical machine, 12 Rotating shaft, 14 Housing, 16 Stator, 18 Rotor, 30 Reduction gear, 40 Differential device, 50 Secondary battery, 54 Electronic control unit (ECU), 80 Salient pole, 80a body, 80c axial flow forming portion, 82, slot, 86 slot opening, 90 resistance surface, 90c axial flow forming surface.

Claims (5)

The salient poles protruding in the radial direction of the rotating shaft have rotors arranged at predetermined intervals in the circumferential direction,
A rotating electrical machine that operates in a state where lubricating oil is present in a motor chamber that houses a rotor,
The salient pole has a resistance surface that receives resistance when the rotor is rotated by the rotation of the rotor.
An axial flow forming surface that is inclined with respect to the axial direction is formed at the axial end portion of the rotating shaft of the resistance surface so as to form an axially outward flow in the lubricating oil hitting the rotating shaft.
Rotating electric machine. The rotating electrical machine according to claim 1,
The magnetic pole of the stator of the rotating electrical machine extends along the axial direction,
The salient pole is
A main body portion extending along the axial direction at substantially the center in the axial direction;
An axial flow forming portion that extends outward in the axial direction from the main body portion and is inclined with respect to the axial direction, and the resistance surface of which is an axial flow forming surface.
Rotating electric machine. The rotating electrical machine according to claim 2,
In the rotating electrical machine, the main rotation direction, which is the direction in which the rotor mainly rotates, is defined,
The axial flow forming portion has an inclination angle set so as to recede from the main body portion toward the rotor end surface with respect to the main rotation direction.
Rotating electric machine. The rotating electrical machine according to claim 3,
A motor chamber that houses the rotor and contains lubricating oil at the bottom;
An oil passage provided outside the rotor end surface in the axial direction and communicating with the outside of the motor chamber;
Have
A rotating electrical machine that discharges the lubricating oil accumulated in the motor chamber to the outside of the motor chamber by forming a flow toward the oil passage when the rotor rotates. The rotating electrical machine according to claim 4,
The rotating electrical machine is integrally coupled with a power transmission mechanism having a gear for transmitting power from the rotating electrical machine, and constitutes a drive device that drives the vehicle.
The drive device is provided with a motor chamber, a gear chamber that houses a gear, and a tank chamber that stores lubricating oil supplied to the motor chamber and the gear chamber,
When the rotor rotates,
Lubricating oil accumulated in the motor chamber is sent from the oil passage to the gear chamber, and further swept up into the tank chamber by the gear, thereby being stored in the tank chamber,
A rotating electrical machine that reduces the amount of oil hitting the resistance surface.

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