JP2006320083A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor whose shaft output can be enhanced. <P>SOLUTION: The motor 1 includes a rotor 3 rotatably held in a housing 8 and a stator 9 placed around the rotor 3. The rotor 3 includes a lubricating oil passage 14 for introducing lubricating oil for bearing portions 7 that rotatably hold the rotor 3. The lubricating oil passage 14 includes an introducing portion 14i for introducing lubricating oil into the rotor 3 and a discharge hole 14o for discharging lubricating oil to the outside of the rotor 3. The discharge hole 14o is so formed that it is extended from the interior to the outer circumferential surface of the rotor 3. The discharge hole 14o is formed at a certain angle of inclination to a straight line passing through the rotating shaft of the rotor 3. Thus, force that facilitates the rotation of the rotor 3 is produced by lubricating oil discharged from the discharge hole 14o, and the shaft output of the motor 1 can be further enhanced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a motor including a rotor rotatably held inside a housing and a stator disposed around the rotor.

High-speed, high-output motors are used everywhere. For example, in recent years, attempts have been made to improve the output at low loads by incorporating a motor into a turbocharger mounted on an internal combustion engine of a vehicle. In such a high speed and high output motor, further improvement in shaft output is an important improvement request item in terms of performance. In order to improve the shaft output, it is necessary to reduce the loss (friction loss and power loss) of each part or increase the input power.
JP-A-11-206063

  In the motor described in [Patent Document 1] described above, lubricating oil for reducing the friction of the rotating shaft of the motor is scattered using the rotational centrifugal force of the rotor to cool the coil end of the stator. The coil generates heat when electricity flows. These heat generations affect the magnetic flux inside the motor and cause a decrease in operating efficiency. Therefore, cooling with lubricating oil is performed in this way to improve efficiency. Conventionally, various ideas have been made, but an object of the present invention is to provide a motor capable of further improving the shaft output.

  The motor according to claim 1 includes a rotor rotatably held inside the housing and a stator disposed around the rotor, and the rotor receives lubricating oil for a bearing portion that rotatably holds the rotor. It has a lubricating oil passage to be introduced, and the lubricating oil passage has an introduction portion for introducing the lubricating oil into the rotor and a discharge hole for discharging the lubricating oil to the outside of the rotor. The discharge hole is formed with an inclination angle with respect to a straight line passing through the rotation axis of the rotor, or has a portion formed with an inclination angle.

  According to a second aspect of the present invention, in the motor according to the first aspect, the discharge hole has a linear portion parallel to a straight line passing through the rotation axis of the rotor on the inner peripheral side of the rotor, and the rotation of the rotor. A portion formed with an inclination angle with respect to a straight line passing through the shaft is provided on the outer peripheral side of the rotor.

  According to a third aspect of the present invention, in the motor according to the first or second aspect, at least a portion of the discharge hole near the outer peripheral surface of the rotor is formed toward the coil end of the stator. It is characterized by.

  According to a fourth aspect of the present invention, in the motor of the third aspect, the inner diameter of the discharge hole on the rotor outer peripheral surface side is smaller than the inner diameter of the rotor inner side.

  According to the motor of the first aspect, the lubricating oil is introduced into the rotor, and the discharge hole for discharging the lubricating oil to the outside of the rotor is formed with an inclination angle with respect to a straight line passing through the rotation axis of the rotor ( This may generate a force that accelerates the rotation of the rotor by the discharged lubricating oil. As a result, the rotor rotation of the motor is promoted, and further improvement in shaft output can be realized. In addition, since only the lubricating oil that facilitates the rotation of the rotor is used for this, a complicated mechanism is not required, and a simple structure can be realized.

  According to the motor of claim 2, the discharge hole is composed of a straight portion parallel to a straight line passing through the rotation axis of the rotor and a portion formed with an inclination angle with respect to the straight line. In the straight portion, the lubricating oil is accelerated outward by the rotational force of the rotor. Then, since the rotational force of the rotor is generated at the inclined portion, a larger rotational force can be obtained. Moreover, since the rotational force is generated closer to the outer periphery of the rotor, the rotational peripheral speed of the rotor is faster than the inner side, and a larger rotational force can be effectively obtained from this point. Furthermore, the straight portion and the inclined portion can be easily formed by, for example, forming the cylindrical portion of the formed rotor (such as a scattering prevention tube for preventing the scattering of the rotor magnet) by drilling. .

  According to the motor of the third aspect, since the discharged lubricating oil is sprayed on the coil end, the coil end is also cooled, and further improvement of the shaft output by the coil end cooling can be realized.

  According to the motor of the fourth aspect, the inner diameter of the discharge hole on the outer peripheral surface side of the rotor is smaller than the inner diameter of the inner side of the rotor, and is formed in a so-called nozzle shape. For this reason, the lubricating oil discharged from the discharge hole is sprayed radially. As a result, since the lubricating oil is sprayed over a wide range on the coil end, the cooling performance is further improved.

  FIG. 1 shows a cross-sectional view of one embodiment of a motor 1 of the present invention. The motor 1 is of a high rotation type built in a turbocharger attached to a vehicle having an internal combustion engine as a drive source. The rotating shaft connecting the turbine wheel of the turbocharger and the compressor wheel is the output shaft 2 of this motor. A rotor 3 is formed on the outer periphery of the output shaft 2. The rotor 3 is composed of a magnet 4, an anti-scattering tube 5 and a sleeve 6 fitted on the outer periphery thereof.

  The anti-scattering tube 5 is for preventing the magnet 4 from being broken and scattered by centrifugal force when the rotor 3 rotates at high speed. The anti-scattering tube 5 is formed of FRP or the like. A sleeve 6 is fitted at both ends of the rotor 3, and a bearing 7 that rotatably holds the output shaft 2 is disposed outside the sleeve 6. The outer periphery of the bearing 7 is held by the housing 8 of the motor 1.

  A stator 9 is disposed outside the rotor 3. The stator 9 includes a multilayer steel plate 10 and a coil 11 wound around the steel plate 10. The stator 9 is fixed to the inner surface of the housing 8. In the housing 8, a lubricating oil supply path 12 that supplies lubricating oil to the bearing 7 described above is formed. In addition, a lubricating oil discharge passage 13 for discharging the lubricating oil dripped inside the housing 8 is also formed in the lower portion of the housing 8.

  A lubricating oil passage 14 is formed in the rotor 3 from the inside of the sleeve 6 to the end of the anti-scattering tube 5. Four lubricating oil passages 14 are formed for each sleeve. Each lubricating oil passage 14 has an introduction hole (introduction portion) 14i for introducing the lubricating oil on the bearing 7 side, and a discharge hole 14o for discharging the lubricating oil on the magnet 4 side (end portion of the anti-scattering tube 5). Each has. 2 is a cross-sectional view of the rotor 3 in a plane perpendicular to the output shaft 2 through the introduction hole 14i, and FIG. 4 is a cross-sectional view of the rotor 3 in a plane perpendicular to the output shaft 2 through the discharge hole 14o. FIG. 3 shows a cross-sectional view of the rotor 3 in a plane that passes between the introduction hole 14 i and the discharge hole 14 o and is perpendicular to the output shaft 2. Each sectional view is a sectional view when the right direction is viewed in each section in FIG. 1.

  First, as shown in FIG. 2, an introduction hole 14 i is formed through the sleeve 6 from the outer peripheral surface to the inner peripheral surface. The introduction hole 14 i forms one end of the lubricating oil passage 14. In the present embodiment, the four introduction holes 14 i are arranged radially from the center of the output shaft 2 at equal intervals in the circumferential direction. The inside of the introduction hole 14 i communicates with an intermediate portion of the lubricating oil passage 14.

  As shown in FIG. 3, the middle portion of the lubricating oil passage 14 extends in parallel to the output shaft 2. The intermediate portion of the lubricating oil passage 14 may be formed inside the sleeve 6, but if the groove is formed on the inner peripheral surface of the sleeve 6 and the outer peripheral surface of the rotary shaft as in this embodiment, the processing is easy. It becomes. This is because it is easier to form a ridge on the peripheral surface without the sleeve 6 than to provide a passage in the sleeve 6.

  As shown in FIG. 4, a discharge hole 14 o is formed so as to be inclined and penetrated from the inner peripheral surface to the outer peripheral surface of the sleeve 6. An annular intermediate chamber 14m is formed inside the discharge hole 14o over the entire circumference between the output shaft 2 and the sleeve 6. The intermediate chamber 14 m communicates with the intermediate portion of all the lubricating oil passages 14. Each discharge hole 14o is formed with an inclination angle with respect to a straight line passing through the center (rotation axis) of the output shaft 2 of the rotor 3.

  The lubricating oil introduced from the introduction hole 14 i passes through the intermediate portion of the lubricating oil passage 14 and reaches the intermediate chamber 14 m. The lubricating oil in the intermediate chamber 14m is discharged outward from the discharge hole 14o by the centrifugal force of the rotating rotor 3, that is, the sleeve 6. At this time, as shown in FIG. 5, when the lubricating oil (shown as oil droplets in FIG. 5) in the discharge hole 14 o receives an external force in the outer peripheral direction due to centrifugal force, a part of the lubricating oil in the sleeve 6, that is, the rotor 3 Acts as a rotating force. Of course, this rotational direction coincides with the rotational direction of the electric force of the motor 1.

  Since this rotational force acts as a force for improving the shaft output of the motor 1, the shaft output of the motor 1 is improved. This mechanism can improve the shaft output of the motor 1 with a simple mechanism that uses the lubrication mechanism of the bearing 7 and only forms the lubricating oil passage 14. Further, in the present embodiment, the direction in which the discharge hole 14 o is formed is directed to the coil end of the stator 9. For this reason, the lubricating oil discharged from the discharge hole 14o is sprayed on the coil end to cool the coil end.

  Even in a coil that generates heat when electricity flows in a motor, the coil end (portion around the laminated steel plate) is a place where heat is easily generated, and cooling this portion leads to an improvement in the operation efficiency of the motor 1. As described above, the heat generation of the coil affects the magnetic flux inside the motor and causes a reduction in operating efficiency. Cooling the coil end that is likely to generate heat effectively improves the shaft output of the motor 1. Contribute to.

  The diameter of the sleeve 6 where the discharge hole 14o is formed is larger than the diameter of the sleeve 6 where the introduction hole 14i is formed. For this reason, the peripheral speed in the discharge hole 14o is faster than the peripheral speed in the introduction hole 14i, and the centrifugal force is also increased in the discharge hole 14o. As a result, the lubricating oil in the lubricating oil passage 14 is more actively discharged from the discharging hole 14o, and accordingly, the lubricating oil is smoothly introduced from the introducing hole 14i. It has become.

  FIG. 6 shows another example of forming the discharge hole 14o. The discharge hole 14o in this example has a linear portion parallel to a straight line passing through the rotation axis of the rotor 3 on the inner side of the rotor 3, and is formed with an inclination angle with respect to the straight line passing through the rotation axis of the rotor 3. This portion is provided on the outer peripheral side of the rotor 3. For this reason, the lubricating oil in the discharge hole 14o is accelerated by receiving the centrifugal force as it is in the direction of the centrifugal force in the linear portion described above, and reaches the inclined portion described above. The lubricating oil in the lubricating oil passage 14 receives a larger centrifugal force near the outer periphery of the rotor 3 (sleeve 6) and generates a larger rotational force. Further, since the operating point of the rotational force is close to the outer peripheral surface of the sleeve 6, the sleeve 6, that is, the rotor is rotated more effectively. As a result, the shaft output of the motor 1 is improved more effectively.

  FIG. 7 shows still another example of forming the discharge hole 14o. In the discharge hole 14o in this example, the outer peripheral surface side of the sleeve 6 is formed in a so-called nozzle shape. For this reason, the lubricating oil discharged from the discharge hole 14o is injected to the coil end of the stator 9 with a certain extent. As a result, the lubricating oil itself is easily cooled at the time of injection, the cooling effect of the coil end is improved, and further contributes to the improvement of the shaft output of the motor 1. Further, since the coil end can be cooled in a wide range, the cooling effect of the coil end is also improved from this point, which further contributes to the improvement of the shaft output of the motor 1.

  The present invention is not limited to the embodiment described above. For example, in the above-described embodiment, the discharge hole is formed in parallel to a plane perpendicular to the rotation axis of the rotor. However, the discharge hole may be inclined in the axial direction of the rotor. By doing so, it takes a long time for the lubricating oil to be present in the discharge hole, which may further contribute to an improvement in shaft output. Moreover, what combined the example of formation of the discharge hole 14o of FIG. 6 and FIG. 7 is also feasible.

It is sectional drawing of one Embodiment of the motor of this invention. It is rotor sectional drawing in the introduction hole part of a lubricating oil channel | path. FIG. 6 is a cross-sectional view of a rotor at an intermediate portion of a lubricant passage. It is rotor sectional drawing in the discharge hole part of a lubricating oil path. It is a partial expanded sectional view of a discharge hole. It is a partial expanded sectional view of a discharge hole (an other example of formation). It is a partial expanded sectional view of a discharge hole (another example of formation).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Output shaft, 3 ... Rotor, 4 ... Magnet, 5 ... Spattering prevention pipe, 6 ... Sleeve, 7 ... Bearing (bearing part), 8 ... Housing, 9 ... Stator, 10 ... Multi-layer steel plate, 11 ... Coil, 14 ... lubricating oil passage, 14i ... introduction hole (introduction part), 14o ... discharge hole, 14m ... intermediate chamber.

Claims (4)

In a motor comprising a rotor rotatably held inside a housing, and a stator disposed around the rotor,
The rotor includes a lubricating oil passage for introducing lubricating oil in a bearing portion that rotatably holds the rotor;
The lubricating oil passage has an introduction portion for introducing lubricating oil into the rotor and a discharge hole for discharging the lubricating oil to the outside of the rotor;
The discharge hole formed through the outer peripheral surface from the inside of the rotor is formed with an inclination angle with respect to a straight line passing through the rotation axis of the rotor, or a portion formed with an inclination angle The motor characterized by having.   The discharge hole has a linear portion parallel to a straight line passing through the rotation axis of the rotor on the inner side of the rotor, and a portion formed with an inclination angle with respect to a straight line passing through the rotation axis of the rotor The motor according to claim 1, wherein the motor is provided on an outer peripheral side of the rotor.   The motor according to claim 1, wherein at least a portion of the discharge hole near the outer peripheral surface of the rotor is formed toward a coil end of the stator. The motor according to claim 3, wherein an inner diameter of the discharge hole on the outer peripheral surface side of the rotor is smaller than an inner diameter of the inner side of the rotor.

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