JP2008118742A - Rotating motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary motor which can reduce the frictional resistance to the rotation of a rotor while suppressing the enlargement of itself by enabling air to be supplied into the space between the rotor and a stator without providing an air supplier for sending air compulsively into the space between the rotor and the stator. <P>SOLUTION: The rotary motor 300 has a stator 117 which is made in tubular form, a rotatable rotating shaft 108, a rotor 118 which is inserted into the stator 117 and is fixed to the rotating shaft 108, a supply port 190A which opens in the peripheral face of the rotor 118 facing the stator 117 and supplies gas into the space between the rotor 118 and the stator 117, an inlet 190B which sucks in gas, and a communication path 190 which makes the supply port 190A and the suction port 190B communicate with each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotary electric motor.

  The internal combustion engines for automobiles include naturally aspirated engines and supercharged engines. As the supercharging mechanism, an exhaust turbine drive type generally called a turbocharger and a mechanical drive type generally called a supercharger have been put into practical use. The turbocharger rotates a turbine with the energy of exhaust gas, compresses intake air with a compressor directly connected thereto, and supplies the compressed air to the engine.

  Since the exhaust energy is small in the low rotation range of the internal combustion engine, a turbocharger that forcibly increases the supercharging pressure in the low rotation range by rotating the compressor by a rotary electric motor is known.

  A rotary electric motor used in such a turbocharger operates at a high speed exceeding several hundred thousand rotations per minute during full power operation. Further, for example, a rotary motor mounted on a hybrid vehicle, an electric vehicle, or the like is operated at several hundred thousand revolutions per minute during full power operation (see Patent Document 1 below). In such a rotary electric motor, the clearance between the rotor and the stator is reduced to improve the operation efficiency.

  However, when lubricating oil enters the gap between the rotor and the stator, the frictional resistance against the rotation of the rotor increases at that portion, and the operating efficiency of the rotary motor is greatly impaired.

  In response to such a problem, for example, Japanese Patent Application Laid-Open No. 2004-108213 discloses a gap between the rotor and the stator in order to prevent the lubricating oil from entering the gap between the rotor and the stator. There has been proposed a rotary electric motor provided with lubricating oil discharging means for blowing air.

In this rotary electric motor, an air outlet is arranged in the axial center of the stator, air is supplied toward the gap between the rotor and the stator, and the air enters between the rotor and the stator. Lubricating oil is discharged to reduce the frictional resistance of the rotor.
JP 2005-6429 A JP 2004-108213 A

  In general, when the rotor rotates, the air located near the outer peripheral surface of the rotor follows the rotation of the rotor. For this reason, in the vicinity of the outer peripheral surface of the rotor, the air flow becomes faster, and the air flow rate becomes slower as the distance from the rotor increases.

  Here, in the rotary electric motor described in the above Japanese Patent Application Laid-Open No. 2004-108213, an air outlet for supplying air to the gap between the rotor and the stator is formed in the stator. Therefore, even if the rotor rotates, the flow velocity of air in the vicinity of the air outlet is slow, and the air pressure in the vicinity of the air outlet is unlikely to be low. For this reason, from Bernoulli's theorem, the air pressure is not sufficiently reduced in the region where the flow velocity is low, and it is difficult to ensure a large pressure difference between the region where air is sucked and the vicinity of the air outlet. It has become.

  Therefore, in order to eject air from the air outlet, a supply device for forcibly sending air to the conduit is required, and a device for sending air to the air outlet is required. By providing such a device, the rotary motor itself is increased in size and the cost of the rotary motor is increased.

  The present invention has been made in view of the problems as described above, and an object of the present invention is to provide a rotor without providing an air supply device for forcing air into a gap between the rotor and the stator. An object of the present invention is to provide a rotary electric motor that can reduce the frictional resistance against the rotation of the rotor while suppressing the increase in size of the rotary electric motor by enabling air to be supplied to the gap with the stator.

  A rotary electric motor according to the present invention includes a cylindrically formed stator, a rotatable rotating shaft, a rotor inserted into the stator and fixed to the rotating shaft, and an opening on an outer peripheral surface of the rotor facing the stator. And a supply port that supplies gas to a gap between the rotor and the stator, a suction port that sucks gas, and a communication path that connects the supply port and the suction port. Preferably, the suction port opens in a space having a pressure higher than the pressure in the gap between the rotor and the stator. Preferably, the suction port is located radially inward of the rotor with respect to the supply port. Preferably, a plurality of the supply ports are provided, and the supply ports are provided at intervals in the axial direction of the rotor. Preferably, the apparatus further includes a housing that houses the rotor and the stator, a support portion that is provided in the housing and rotatably supports the rotating shaft, and a lubricating oil supply mechanism that supplies lubricating oil to the supporting portion. The mouth is located outside the housing. Preferably, the suction port is formed at an axial end portion of the shaft. Preferably, the supply port is formed on the outer peripheral surface of the rotor positioned inward in the axial direction of the rotor from the axial end portion of the rotor. Preferably, the supply port is located at an axial end portion of the rotor. Preferably, the communication path is formed between the rotor and the shaft, and includes a gas storage space that can store gas, a first communication path that connects the gas storage space and the suction port, a gas storage space, and a supply port. And a second communication passage communicating with each other. Preferably, the communication path is formed in the rotor, and has an inclined path that inclines toward the rear side in the rotational direction of the rotor and reaches the supply port as it goes from the inner diameter side to the outer diameter side of the rotor. Preferably, it further includes a non-magnetic annular member provided between the stator and the rotor and having a gap provided between the inner peripheral surface and the outer peripheral surface of the rotor.

  According to the rotary electric motor of the present invention, since the supply port is opened on the outer peripheral surface of the rotor, the rotor rotates, and the gas in the vicinity of the outer peripheral surface of the rotor flows following the rotation of the rotor. When the pressure in the vicinity of the outer peripheral surface decreases, a large pressure difference can be generated between the vicinity of the suction port and the vicinity of the supply port. For this reason, without providing a supply mechanism for forcibly supplying the gas, the gas can be sucked from the suction port, and the sucked gas can be ejected from the supply port. That is, foreign matter that has entered the gap between the rotor and the stator can be eliminated without increasing the size of the rotary motor, and foreign matter can be prevented from entering between the rotor and the stator.

  A rotary motor 300 according to the present embodiment will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a schematic configuration of a turbocharger 100 to which a rotary electric motor 300 according to the present embodiment is applied.

  As shown in FIG. 1, a turbocharger 100 includes a compressor 124 provided on an intake path of an internal combustion engine (hereinafter referred to as an engine), a turbine 126 provided on an exhaust path of the engine, a compressor The bearing housing 102 is provided between the turbine 124 and the turbine 126, and the rotary motor 300 is provided in the bearing housing 102.

  The compressor 124 includes a compressor housing 104 and a compressor wheel (also referred to as a compressor rotor, a compressor blade, etc.) 110. The turbine 126 includes a turbine housing 106 and a turbine wheel (also referred to as a turbine rotor, a turbine blade, or the like) 112.

  The compressor wheel 110 and the turbine wheel 112 are connected by a shaft 108. The bearing housing 102 rotatably supports the shaft 108.

  The turbocharger 100 according to the present embodiment is a supercharging mechanism that is mounted on a vehicle engine. The engine may be a gasoline engine or a diesel engine, and is not particularly limited. The vehicle may be a hybrid vehicle and is not particularly limited. Further, the turbocharger according to the present invention is not limited to a vehicle.

  The compressor housing 104 includes an inlet 122 formed at a portion located in the axial direction of the shaft 108 and an outlet formed on a side surface of the compressor housing 104 with respect to the shaft 108.

  One end of an intake passage 200 that extends along the axial direction of the shaft 108 is connected to the inlet 122. One end of the intake passage 210 is connected to the outlet from a direction orthogonal to the axial direction of the shaft 108.

  The other end of the intake passage 200 is connected to an air cleaner, and the other end of the intake passage 210 is connected to an intercooler. An adjustment valve 204 is provided in the middle of the intake passage 200. A bypass passage 202 that connects the intake passage 200 and the intake passage 210 is connected to the intake passage 200 located on the upstream side of the adjustment valve 204.

  An adjustment valve 206 is also provided at the end of the bypass passage 202, and the initial state is a closed state.

  The turbine housing 106 adjacent to the bearing housing 102 is provided with an inlet at a position orthogonal to the rotation axis of the shaft 108. An inlet of the turbine housing 106 is connected to one end of the exhaust passage 212. The other end of the exhaust passage 212 is connected to an exhaust manifold of the engine. The turbine housing 106 is provided with an outlet 128 in the extending direction of the rotation axis of the shaft 108. The outlet 128 of the turbine housing 106 is connected to the catalyst.

  The shaft 108 is provided so as to penetrate the bearing housing 102. A compressor wheel 110 is provided at one end of the shaft 108 and is accommodated in the compressor housing 104. A turbine wheel 112 is provided at the other end of the shaft 108 and is accommodated in the turbine housing 106.

  ECU 500 includes a CPU and a memory. ECU 500 executes the program stored in the memory to control the states of regulating valve (1) 204 and regulating valve (2) 206 via the actuator according to the temperature detected by the temperature detection sensor. The rotary electric motor 300 is controlled. The temperature sensor is arranged in the bearing housing 102 and can measure the temperature in the bearing housing 102.

  The bearing housing 102 is provided between the compressor housing 104 and the turbine housing 106 so as to be adjacent to each other. The bearing housing 102 is formed in a hollow cylindrical shape around the shaft 108, and two bearings 114 and two thrust bearings 129 that rotatably support the shaft 108 are respectively provided at both ends in the axial direction.

  Further, at both ends in the axial direction of the bearing housing 102, a lubricating oil passage 116 is formed in a direction orthogonal to the axis, and the lubricating oil passes between the bearing 114 and the shaft 108 via the lubricating oil passage 116. Supplied. Lubricating oil is supplied between the bearing 114 and the shaft 108 by driving an oil pump according to the operation of the engine.

  The bearing housing 102 is further provided with a hollow portion 120 and a rotary electric motor 300 housed in the hollow portion 120 and having the shaft 108 as a rotation axis.

  The rotary electric motor 300 rotates the shaft 108 upon receiving electric power. The rotary electric motor 300 is an AC motor, for example, and can function as an electric motor or a generator. The rotary electric motor 300 is not particularly limited to an AC motor, and may be a DC motor.

  The rotary electric motor 300 is fixed to the bearing housing 102 and has a cylindrically formed stator 117, a shaft 108 rotatably provided on the bearing housing 102, and a shaft fixed to the shaft 108 and disposed in the stator 117. A rotor 118 and a supply mechanism 400 that supplies air (gas) to a gap between the stator 117 and the rotor 118 are provided.

  The stator 117 is provided slightly spaced from the rotor 118, and a gap GP is formed between the stator 117 and the rotor 118.

  The supply mechanism 400 is formed on the outer peripheral surface of the rotor 118 facing the stator 117, and includes a supply port 190A that supplies air to the gap GP between the rotor 118 and the stator 117, a suction port 190B that sucks air (gas), A communication path 190 that communicates the suction port 190B and the supply port 190A is provided.

  Since supply port 190 </ b> A is formed on the outer peripheral surface of rotor 118, when rotor 118 rotates, air near the outer peripheral surface of rotor 118 follows the movement of rotor 118. For this reason, as is clear from Bernoulli's theorem, the air pressure in the vicinity of the outer peripheral surface of the rotor 118 decreases. As a result, air is sucked from the suction port 190B and air is ejected from the supply port 190A. Then, foreign matter such as lubricating oil that has entered the gap GP can be discharged outward by the air blown from the supply port 190A. Furthermore, foreign matter such as lubricating oil enters the gap GP by air blowing out from the opening GPa defined by the outer peripheral edge located at the axial end of the rotor 118 and the inner peripheral surface of the stator 117. Can be suppressed. Thus, the frictional resistance against the rotation of the rotor 118 can be reduced, and the operating efficiency of the rotary electric motor 300 can be improved.

  Here, when the rotor 118 is rotating at a high speed, the flow velocity of air becomes slower from the surface of the rotor 118 toward the stator 117. For this reason, in the gap GP, the closer to the outer surface of the rotor 118, the lower the pressure. Therefore, in the present embodiment, the supply port 190A is formed on the outer surface of the rotor 118, thereby reducing the pressure in the vicinity of the supply port 190A and ensuring the air flow.

  The suction port 190B is located radially inward of the rotor 118 with respect to the supply port 190A. That is, the supply port 190A is positioned radially outward of the rotor 118 from the suction port 190B, and when the rotor 118 rotates, the air flow positioned near the supply port 190A is positioned near the suction port 190B. It will be faster than the air flow.

  Therefore, according to Bernoulli's theorem, the air pressure in the vicinity of the supply port 190A is lower than the air pressure in the vicinity of the suction port 190B, and the air flow from the supply port 190A toward the suction port 190B can be reliably generated. Thus, air can be satisfactorily supplied from the supply port 190A to the gap GP between the rotor 118 and the stator 117.

  The supply port 190 </ b> A is formed in a portion of the shaft 108 located outside the bearing housing 102. For this reason, the lubricating oil from the lubricating oil passage 116 is not included in the air taken in from the supply port 190A, and the lubricating oil can be prevented from entering the gap GP.

  Further, in the present embodiment, the suction port 119B is formed at an end portion located in the axial direction of the shaft 108, and is formed so as to overlap the rotation axis O of the shaft 108 and the rotor 118.

  The outer peripheral surface of the end portion of the shaft 108 has a smaller distance to the rotation axis O than the outer peripheral surface of the rotor 118. For this reason, when the rotor 118 rotates, the rotational speed of the outer peripheral surface of the rotor 118 becomes smaller than the rotational speed of the outer peripheral surface of the shaft 108. Then, the flow velocity of air near the outer peripheral surface of the rotor 118 is much faster than the flow velocity of air near the end of the shaft 108. Therefore, by opening the suction port 190B at the end of the shaft 108, the pressure near the supply port 190A can be reliably lowered than the pressure near the suction port 119B.

  The air located on the rotation axis O is hardly affected even when the rotor 118 and the shaft 108 rotate. Therefore, by positioning the suction port 190B on the rotation axis O, when the rotor 118 rotates, it is possible to ensure a large difference between the flow rate of air near the suction port 190B and the flow rate of air near the supply port 119A. Out. A large difference between the air pressure in the vicinity of the supply port 119A and the air pressure in the vicinity of the suction port 119B can be secured. Furthermore, since the intake passage 200 is provided along the rotation axis O of the shaft 108, the intake port 190B formed on the axial end surface of the shaft 108 can easily take in air flowing through the intake passage 200. .

  The communication path 190 is connected to the suction port 190B, and a path 191 extending in the axial direction on the rotation axis O of the shaft 108, a path 192B connected to the path 191 and extending in the radial direction of the shaft 108, and a path 192B And a path 192B that extends in the radial direction of the rotor 118 and reaches the supply port 119A.

  Since the path 192B extends in a direction substantially perpendicular to the inner peripheral surface of the stator 117, the air discharged from the supply port 190A is ejected substantially perpendicularly to the stator 117. The supply port 190 </ b> A is formed on the outer peripheral surface of the rotor 118 that is positioned inward in the axial direction from the axial end portion of the rotor 118 in the peripheral surface of the rotor 118. The air supplied from the supply port 190 </ b> A is diverted toward both ends of the rotor 118. For this reason, it is possible to prevent the foreign matter from being discharged into the gap GP and the foreign matter from entering the gap GP. The supply port 190 </ b> A is preferably opened on the outer peripheral surface of the rotor 118 located at the axial center of the rotor 118. When the supply port 190A is formed at such a position, the air ejected from the supply port 190A can be divided approximately evenly without being biased in the axial direction of the rotor 118.

  2 is a cross-sectional view taken along line II-II in FIG. As shown in FIG. 2, a plurality of supply ports 190 </ b> A are formed in the circumferential direction of the rotor 118. For this reason, air can be supplied uniformly over the circumferential surface of the rotor 118 on the circumferential surface of the rotor 118. That is, the foreign matter can be discharged and the foreign matter can be prevented from entering evenly in both the axial direction and the circumferential direction of the rotor 118.

  As shown in FIG. 2, the stator 117 includes a plurality of stator teeth 117A protruding toward the rotor 118, and a coil 117B wound around the stator teeth 117A.

  When air is supplied from supply port 190A, stator teeth 117A and coil 117B are cooled, and the driving efficiency of rotary electric motor 300 can be improved.

  The operation of the turbocharger 100 configured as described above will be described. In FIG. 1, first, after the air mixed with fuel is burned in the engine, the exhaust gas is guided into the turbine 126 from an exhaust manifold connected to each cylinder of the engine. The exhaust gas then rotates the turbine wheel 112 and the rotational force is transmitted to the shaft 108. Thereafter, the exhaust gas is guided to the catalyst and discharged outside the vehicle in a purified state.

  On the other hand, the air taken from outside the vehicle to be supplied to the engine is filtered by an air cleaner and then guided to the compressor 124. The air is then compressed (pressurized) by a compressor wheel 110 that rotates integrally with the shaft 108. The compressed air is guided to the intercooler, and is sucked into the intake manifold of the engine in a cooled state.

  In addition, when the air compressed by the compressor 124 does not reach a desired boost pressure in the low engine speed range (for example, when the engine speed is equal to or lower than a predetermined engine speed), the ECU 500 By driving the rotary motor 300, the supercharging pressure of the compressor 124 is controlled to be forcibly increased.

  While the rotary electric motor 300 is being driven, air is supplied from the supply port 200 to the gap GP, and foreign matter is discharged from the gap GP, whereby the resistance to rotation of the rotor 118 can be reduced, and the driving capability of the rotary electric motor 300 can be reduced. Can be secured.

  FIG. 3 is a cross-sectional view showing a first modification of the rotary electric motor according to the present embodiment. As shown in FIG. 3, a supply port 190 </ b> A is formed on the end side in the axial direction of the rotor 118. Then, the path 192B extends so as to incline from the axially central portion of the rotor 118 toward both ends in the axial direction as it goes from the radially inner side of the rotor 118 to the radially outer side.

  For this reason, the air ejected from the supply port 190A is ejected outward from the gap GP, and foreign substances such as lubricating oil can be effectively suppressed from entering the gap GP.

  FIG. 4 is a cross-sectional view showing a second modification of the rotary electric motor according to the present embodiment. As shown in FIG. 4, the communication path 190 is formed in the rotor 118, a gas containing space 192 </ b> D extending in the axial direction of the rotor 118, a path 191 formed in the shaft 108 and extending on the rotation axis O, and the shaft And a path 192C1 and 192C2 that connect the gas storage space 192D and the path 191 and a path 192E that is connected to the gas storage space 192D and reaches the supply port 190A.

  The gas storage space 192D is formed on the inner peripheral surface of the rotor 118, and is defined by a recess extending in the axial direction of the rotor 118 and an outer peripheral surface of the shaft 108 closing the opening of the recess. That is, the gas containing space 192 </ b> D is formed between the rotor 118 and the stator 11. The gas containing space 192 </ b> D may be located not only when it is located on the outer surface of the rotor 118 but also inside.

  Thus, since the gas containing space 192D extends in the axial direction of the rotor 118, the plurality of paths 192C1 and 192C2 can be distributed in the axial direction of the shaft 108 without being concentrated on a part of the shaft 108. Thereby, it is possible to avoid a decrease in the rigidity of the shaft 108 due to the concentration of the plurality of paths 192C1 and 192C2 in one place, and the rigidity of the shaft 108 can be ensured. Furthermore, since the plurality of paths 192C1 and 192C2 can be distributed in the axial direction of the shaft 108, the total flow path area can be secured even if the flow path areas of the paths 192C1 and 192C2 are reduced. Therefore, it is possible to suppress the reduction of the cross-sectional secondary moment and rigidity of the portion of the shaft 108 where the paths 192C1 and 192C2 are located, and it is possible to suppress the deformation of the shaft 108 during driving.

  5 is a cross-sectional view taken along line VV shown in FIG. 4, and FIG. 6 is a cross-sectional view taken along line VI-VI shown in FIG. As shown in FIGS. 5 and 6, the gas containing space 192 </ b> D extends in the circumferential direction of the rotor 118 and the shaft 108 and is formed in an annular shape. Therefore, each of the paths 192C1 and 192C2 can extend over the radial direction of the shaft 108, and when the air flows through the paths 192C1 and 192C2, the paths 192C1 and 192C2 are defined. The radial force that the shaft 108 receives from the air can be offset. For this reason, it is possible to prevent the shaft 108 from vibrating when the rotary electric motor 300 is driven.

  Furthermore, each path 192C1, 192C2 extends in a direction intersecting with each other. For this reason, even if air flows through each of the paths 192C1 and 192C2, the force received from the air on the wall surface of the shaft 108 that defines the paths 192C1 and 192C2 can be offset, and the shaft 108 is deformed such as torsion. Can be suppressed.

  In the example shown in FIGS. 4 to 6, the paths 192C1 and 192C2 are formed at two locations and extend in directions orthogonal to each other. However, a plurality of paths 192C1 and 192C2 may be provided. The inclination angle is appropriately changed according to the number provided.

  FIG. 7 is a cross-sectional view showing a third modification of the rotary electric motor according to the present embodiment. As shown in FIG. 7, the communication path 190 is formed on the inner peripheral surface of the rotor 118, and a plurality of gas storage spaces 192 </ b> D extending in the axial direction of the rotor 118, and a plurality of gas storage spaces 192 </ b> D and the supply ports 190 </ b> A are connected. Route 192F1, 102F2.

  Since the gas containing space 192D extends in the axial direction of the rotor 118, the paths 192F1 and 102F2 can be provided so as to avoid the magnet 195 provided in the rotor 118. For this reason, it is not necessary to form holes through which the paths 192F1 and 192F2 pass in the magnet 195, and a decrease in the volume of the magnet 195 can be prevented. Thereby, the amount of magnetic flux generated from the magnet 195 can be secured, and the performance of the rotary electric motor 300 can be secured. Furthermore, in general, since the strength of a magnet is low, when an attempt is made to manufacture a magnet having a hole, a problem such as cracking of the magnet is likely to occur. Therefore, according to the example shown in FIG. Can be secured.

  FIG. 8 is a cross-sectional view showing a fourth modification of the rotary electric motor according to the present embodiment. As shown in FIG. 8, the rotary electric motor 300 includes a stator tooth 117A formed on the stator 117 and a coil 1117B wound around the stator tooth 117A. A notch (guide portion) 117C for guiding the air supplied from the supply port 190A to the coil 117B is formed on the inner peripheral surface of the stator 117.

  The notch 117 </ b> C is an inner peripheral surface of the stator 117 formed in a cylindrical shape, and is formed at an end of the stator 117 in the axial direction. That is, it is formed at the opening edge of the stator 117. A supply port 190A is formed on the peripheral surface of the rotor 118 located radially inward of the stator 117 with respect to the notch 117C.

For this reason, the coil 117B can be favorably cooled by directly blowing the air blown from the supply port 190A onto the coil 117B. Specifically, the air guided by the notch 117C is guided toward the coil end 310 to cool the coil 117B. Thereby, the drive capability of the rotary electric motor 300 can be improved. FIG. 15 is a cross-sectional view showing a modification of FIG. 8. As shown in FIG. 15, instead of the notch 117C shown in FIG. 8, the supply port 190A is slightly outside the axial width of the stator ( It may be arranged at the end of the rotor in the axial direction) and sprayed to the coil 117B from the supply hole 190A without guidance of the notch 117C. In this case, it is possible to reduce the resistance due to the air blown off at the axial end of the gap GP. FIG. 9 is a cross-sectional view showing a fifth modification of the rotary electric motor according to the present embodiment. As shown in FIG. 9, a plurality of supply ports 190 </ b> A <b> 1 to 190 </ b> A <b> 8 are formed on the surface of the rotor 118.

  Here, out of the sides defining the inner circumferential surface facing the rotor 118 in the surface of the stator teeth 117A, the angles formed by the sides 117A1 and 117A2 arranged in the circumferential direction of the stator 117 and the rotation axis O Is an angle θ1.

  Of the angles formed by one supply port 190A1 and supply ports 190A2 and 190A8 immediately adjacent to the one supply port 190A1 in the circumferential direction of the rotor 118, and the central axis, the smaller angle is defined as an angle θ2. .

  The supply port 190A1 is arranged such that the largest θ2 of the angles θ2 is smaller than the angle θ1. That is, the inner peripheral surface of the stator teeth 117A always faces one of the supply ports 190A1 to 190A8 during one rotation of the rotor 118.

  Thus, air is always blown from the supply ports 190A1 to 190A8 to the inner peripheral surface of the stator teeth 117A, and the inner peripheral surface of the stator teeth 117A can be cooled. In addition, since air is always blown onto the stator teeth 117A, foreign matters adhering to the surface of the stator teeth 117A can be eliminated and entry of foreign matters can be suppressed.

  In the example illustrated in FIG. 9, the supply ports 190 </ b> A <b> 1 to 190 </ b> A <b> 8 are formed at equal intervals in the circumferential direction of the rotor 118, but are not limited thereto.

  FIG. 10 is a cross-sectional view showing a sixth modification of the rotary electric motor according to the present embodiment. As shown in FIG. 10, the communication path 190 is formed in the shaft 108, a path 191 extending in the axial direction of the shaft 108, a path 192 A formed in the shaft 108 and connected to the path 191, and the rotor 118. And a path 192B formed and connected to the path 192A.

  Here, the path 192 </ b> A is inclined toward the rear side in the rotational direction P of the rotor 118 from the connection point with the path 191 toward the outer main surface of the shaft 108. Furthermore, the path 192B is inclined toward the rear side in the rotation direction P of the rotor 118 as it goes from the connection point with the path 192A toward the outer peripheral surface of the rotor 118.

  For this reason, the air blown out from the supply port 190 </ b> A is ejected toward the rear side in the rotation direction P of the rotor 118. Thereby, the rotor 118 can be accelerated in the rotation direction by a reaction force when air is ejected from the supply port 190A.

  FIG. 11 is a cross-sectional view showing a modification of the rotary electric motor shown in FIG. As shown in FIG. 11, the communication path 190 includes a path 192H formed in the shaft 108 and extending in the radial direction of the shaft 108, and a path 192I formed in the rotor 118 and connected to the path 192H.

  The path 192I is formed so as to incline toward the rear side in the rotation direction P of the rotor 118 from the connection point with the path 192H toward the outer surface of the rotor 118. For this reason, similarly to the turbocharger shown in FIG. 10, the rotor 118 is accelerated when air is ejected from the supply port 190A.

  FIG. 12 is a cross-sectional view showing a seventh modification of the rotary electric motor according to the present embodiment. As shown in FIG. 12, the communication path 190 includes a path 191 formed in the shaft 108 and extending in the axial direction of the shaft 108, and a path 191 connecting the path 191 and the supply port 190A. The path 192 extends in the radial direction of the rotor 118 and the shaft 108, and a plurality of paths 192 are formed radially. A magnet 195 </ b> A is provided in a portion of the rotor 118 located between the paths 192.

  By disposing the magnet 195A between the paths 192, it is not necessary to form a hole through which the path 192 passes in the magnet 195A, and the strength of the magnet 195A can be ensured.

  FIG. 13 is a cross-sectional view showing an eighth modification of the rotary electric motor according to the present embodiment, and FIG. 14 is a cross-sectional view taken along line XIV-XIV shown in FIG.

  As shown in FIG. 13, the rotary motor includes a non-magnetic annular member 217 provided between the stator 117 and the rotor 118 and spaced from the outer peripheral surface of the rotor 118. The annular member 217 is in contact with the inner peripheral surface of each stator tooth 117A. The inner peripheral surface of the hole 217A formed at the center of the annular member 217 is separated from the outer peripheral surface of the rotor 118, and between the inner peripheral surface of the hole 217A and the outer peripheral surface of the rotor 118, A gap GP is formed.

  The annular member 217 fills the space between the stator teeth 117A adjacent in the circumferential direction of the stator 117, and the space located between the inner peripheral surface of the stator teeth 117A and the inner peripheral surface of the rotor 118 is reduced. In FIG. 14, the space located on the outer peripheral surface side of the rotor 118 can be reduced, and the flow velocity of the air ejected from the supply port 190A can be increased. Thereby, even if foreign matter such as lubricating oil enters the gap GP from the opening portion of the gap GP between the rotor 118 and the stator 117 located at the end in the axial direction, the foreign material such as lubricating oil can be pushed out by the jetted air.

  That is, in the example shown in FIGS. 13 and 14, the annular member 217 occupies most of the space located between the rotor 118 and the stator 117, so that it is located between the rotor 118 and the annular member 217. The volume of the gap is reduced, the flow velocity of flowing air is improved, and the entry of foreign matter is suppressed.

  Although the embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Furthermore, the above numerical values are examples, and are not limited to the above numerical values and ranges.

  The present invention is suitable for a rotary motor, and particularly suitable for a rotary motor provided in a turbocharger.

It is sectional drawing which shows schematic structure of the turbocharger to which the rotary electric motor which concerns on this Embodiment is applied. It is sectional drawing in the II-II line of FIG. It is sectional drawing which shows the 1st modification of the rotary electric motor which concerns on this Embodiment. It is sectional drawing which shows the 2nd modification of the rotary electric motor which concerns on this Embodiment. It is sectional drawing in the VV line shown by FIG. It is sectional drawing in the VI-VI line shown by FIG. It is sectional drawing which shows the 3rd modification of the rotary electric motor which concerns on this Embodiment. It is sectional drawing which shows the 4th modification of the rotary electric motor which concerns on this Embodiment. It is sectional drawing which shows the 5th modification of the rotary electric motor which concerns on this Embodiment. It is sectional drawing which shows the 6th modification of the rotary electric motor which concerns on this Embodiment. It is sectional drawing which shows the modification of the rotary electric motor shown by FIG. It is sectional drawing which shows the 7th modification of the rotary electric motor which concerns on this Embodiment. It is sectional drawing which shows the 8th modification of the rotary electric motor which concerns on this Embodiment. It is sectional drawing in the XIV-XIV line | wire shown in FIG. It is sectional drawing which shows the modification of FIG.

Explanation of symbols

  100 Turbocharger, 102 Bearing housing, 104 Compressor housing, 106 Turbine housing, 108 Shaft, 110 Compressor wheel, 112 Turbine wheel, 114 Bearing, 116 Lubricating oil passage, 117 Stator, 117A Stator tooth, 117C Notch, 117B Coil, 118 Rotor, 119A supply port, 119B suction port, 120 hollow portion, 190A supply port, 190B suction port, 190 communication path, O rotation axis, P rotation direction, 300 rotation motor.

Claims (11)

A cylindrically formed stator;
A rotatable rotating shaft;
A rotor inserted into the stator and fixed to the rotating shaft;
A supply port that opens to an outer peripheral surface of the rotor facing the stator and supplies gas to a gap between the rotor and the stator;
An inlet for inhaling the gas;
A communication path communicating the supply port and the suction port;
Rotating electric motor with   The rotary electric motor according to claim 1, wherein the suction port opens into a space having a pressure higher than a pressure in a gap between the rotor and the stator.   The rotary electric motor according to claim 1, wherein the suction port is located radially inward of the rotor with respect to the supply port.   The rotary electric motor according to any one of claims 1 to 3, comprising a plurality of the supply ports, wherein the supply ports are provided at intervals in the axial direction of the rotor. A housing for housing the rotor and the stator;
A support portion provided in the housing and rotatably supporting the rotating shaft;
A lubricating oil supply mechanism for supplying lubricating oil to the support;
Further comprising
The rotary electric motor according to any one of claims 1 to 4, wherein the suction port is located outside the housing.   The rotary electric motor according to claim 1, wherein the suction port is formed at an axial end portion of the shaft.   The rotary electric motor according to any one of claims 1 to 6, wherein the supply port is formed on an outer peripheral surface of the rotor positioned inward in the axial direction of the rotor from an axial end portion of the rotor.   The rotary electric motor according to any one of claims 1 to 7, wherein the supply port is located at an axial end of the rotor.   The communication path is formed between the rotor and the shaft, and includes a gas storage space that can store the gas, a first communication path that connects the gas storage space and the suction port, and the gas storage space. The rotary electric motor according to any one of claims 1 to 8, further comprising a second communication passage that communicates with the supply port.   The communication path is formed in the rotor, and has an inclined path that inclines toward the rear side in the rotation direction of the rotor and reaches the supply port as it goes from the inner diameter side of the rotor to the outer diameter side. The rotary electric motor according to any one of claims 1 to 9.   11. The apparatus according to claim 1, further comprising a non-magnetic annular member provided between the stator and the rotor and provided with a gap between an inner peripheral surface and the outer peripheral surface of the rotor. The rotary motor described in 1.

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